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Future Blog Post

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Published: January 01, 2199

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Blog Post number 4

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Published: August 14, 2015

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Blog Post number 3

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Published: August 14, 2014

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Blog Post number 2

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Published: August 14, 2013

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Blog Post number 1

less than 1 minute read

Published: August 14, 2012

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publications

Environmental Changes in MoTe2 Excitonic Dynamics by Defects-Activated Molecular Interaction

Published in ACS Nano 2015, 9 (5), 5326–5332

XPS measurements and DFT calculations reveal that defect-activated O₂ functionalization at MoTe₂ monolayer surfaces creates deep or shallow states within the optical band gap, governing the material’s excitonic dynamics and environmental aging response.

Recommended citation: Chen, B.; Sahin, H.; Suslu, A.; Ding, L.; Bertoni, M. I.; Peeters, F. M.; Tongay, S. Environmental Changes in MoTe2 Excitonic Dynamics by Defects-Activated Molecular Interaction. ACS Nano 2015, 9 (5), 5326–5332.
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Controlling Structural Anisotropy of Anisotropic 2D Layers in Pseudo-1D/2D Material Heterojunctions

Published in Advanced Materials 2017, 29 (34), 1701201

The first CVD-grown ReS₂/WS₂ lateral and vertical heterojunctions are demonstrated: lateral junctions produce highly oriented Re-chains perpendicular to WS₂ edges, while vertical stacking induces six-fold Re-chain rotation and loss of macroscopic anisotropy, establishing a route to controlled large-scale nanomanufacturing of anisotropic 2D systems.

Recommended citation: Chen, B.; Wu, K.; Suslu, A.; Yang, S.; Cai, H.; Yano, A.; Soignard, E.; Aoki, T.; March, K.; Shen, Y.; Tongay, S. Controlling Structural Anisotropy of Anisotropic 2D Layers in Pseudo-1D/2D Material Heterojunctions. Advanced Materials 2017, 29 (34), 1701201.
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Solution-Processed Perovskite-Colloidal Quantum Dot Tandem Solar Cells for Photon Collection beyond 1000 nm

Published in Journal of Materials Chemistry A 2019, 7 (45), 26020–26028

A solution-processed four-terminal perovskite/CQD tandem is demonstrated using a dielectric-metal-dielectric semi-transparent top cell optimized by optical admittance engineering, achieving >20% PCE with spectral collection extending beyond 1000 nm.

Recommended citation: Manekkathodi, A.^†; Chen, B.^†; Kim, J.; Baek, S.-W.; Scheffel, B.; Hou, Y.; Ouellette, O.; Saidaminov, M. I.; Voznyy, O.; Madhavan, V. E.; Belaidi, A.; Ashhab, S.; Sargent, E. H. Solution-Processed Perovskite-Colloidal Quantum Dot Tandem Solar Cells for Photon Collection beyond 1000 nm. Journal of Materials Chemistry A 2019, 7 (45), 26020–26028.
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Enhanced Optical Path and Electron Diffusion Length Enable High-Efficiency Perovskite Tandems

Published in Nature Communications 2020, 11 (1), 1257

A boosted solvent extraction method increases perovskite film thickness while preserving smooth morphology, and a Lewis base additive extends the electron diffusion length to 2.3 μm, enabling 19% semi-transparent top cells and 28.2% perovskite/silicon tandem solar cells.

Recommended citation: Chen, B.; Baek, S.-W.; Hou, Y.; Aydin, E.; De Bastiani, M.; Scheffel, B.; Proppe, A.; Huang, Z.; Wei, M.; Wang, Y.-K.; Jung, E.-H.; Allen, T. G.; Van Kerschaver, E.; García de Arquer, F. P.; Saidaminov, M. I.; Hoogland, S.; De Wolf, S.; Sargent, E. H. Enhanced Optical Path and Electron Diffusion Length Enable High-Efficiency Perovskite Tandems. Nature Communications 2020, 11 (1), 1257.
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Bifunctional Surface Engineering on SnO2 Reduces Energy Loss in Perovskite Solar Cells

Published in ACS Energy Letters 2020, 5 (9), 2796–2801

NH₄F surface treatment on SnO₂ simultaneously reduces surface defects and induces chemical doping of the substrate, improving energetic alignment and achieving 23.2% PCE in perovskite solar cells.

Recommended citation: Jung, E. H.^†; Chen, B.^†; Bertens, K.; Vafaie, M.; Teale, S.; Proppe, A.; Hou, Y.; Zhu, T.; Zheng, C.; Sargent, E. H. Bifunctional Surface Engineering on SnO2 Reduces Energy Loss in Perovskite Solar Cells. ACS Energy Letters 2020, 5 (9), 2796–2801.
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Passivation of the Buried Interface via Preferential Crystallization of 2D Perovskite on Metal Oxide Transport Layers

Published in Advanced Materials 2021, 33 (41), e2103394

Organic spacer cations bearing −NH₂ groups preferentially bind to under-coordinated oxygens on metal oxide substrates, inducing spontaneous 2D perovskite crystallization at the buried interface that reduces surface recombination velocity by 72% and enables up to 22.9% PCE in inverted solar cells.

Recommended citation: Chen, B.; Chen, H.; Hou, Y.; Xu, J.; Teale, S.; Bertens, K.; Chen, H.; Proppe, A.; Zhou, Q.; Yu, D.; Xu, K.; Vafaie, M.; Liu, Y.; Dong, Y.; Jung, E. H.; Zheng, C.; Zhu, T.; Ning, Z.; Sargent, E. H. Passivation of the Buried Interface via Preferential Crystallization of 2D Perovskite on Metal Oxide Transport Layers. Advanced Materials 2021, 33 (41), e2103394.
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Grain Boundary Engineering with Self-Assembled Porphyrin Supramolecules for Highly Efficient Large-Area Perovskite Photovoltaics

Published in Journal of the American Chemical Society 2021, 143 (45), 18989–18996

NiP porphyrin supramolecules self-assemble at perovskite grain boundaries, where organic cations convert them into hole-transporting ammonium porphyrins that simultaneously passivate defects and promote inter-grain hole transport, yielding certified 22.1% PCE on 1.0 cm² with stability exceeding 3000 h under illumination or at 85 °C.

Recommended citation: Fang, Z.^†; Wang, L.^†; Mu, X.^†; Chen, B.^†; Xiong, Q.; Wang, W. D.; Ding, J.; Gao, P.; Wu, Y.; Cao, J. Grain Boundary Engineering with Self-Assembled Porphyrin Supramolecules for Highly Efficient Large-Area Perovskite Photovoltaics. Journal of the American Chemical Society 2021, 143 (45), 18989–18996.
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Quantum-Size-Tuned Heterostructures Enable Efficient and Stable Inverted Perovskite Solar Cells

Published in Nature Photonics 2022, 16 (5), 352–358

Bulkier organic spacers slow 2D heterostructure formation to produce wider (n ≥ 3) reduced-dimensional perovskites that eliminate electron blocking at the 2D/3D interface, enabling certified 23.91% inverted perovskite solar cells stable at 50% relative humidity for >1000 h.

Recommended citation: Chen, H.^†; Teale, S.^†; Chen, B.^†; Hou, Y.^†; Grater, L.; Zhu, T.; Bertens, K.; Park, S. M.; Atapattu, H. R.; Gao, Y.; Wei, M.; Johnston, A. K.; Zhou, Q.; Xu, K.; Yu, D.; Han, C.; Cui, T.; Jung, E. H.; Zhou, C.; Zhou, W.; Proppe, A. H.; Hoogland, S.; Laquai, F.; Filleter, T.; Graham, K. R.; Ning, Z.; Sargent, E. H. Quantum-Size-Tuned Heterostructures Enable Efficient and Stable Inverted Perovskite Solar Cells. Nature Photonics 2022, 16 (5), 352–358.
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What Does Net Zero by 2050 Mean to the Solar Energy Materials Researcher?

Published in Matter 2022, 5 (5), 1322–1325

This perspective discusses how solar energy materials researchers must address efficiency, stability, and manufacturing scalability challenges to enable solar photovoltaics to play its key role in decarbonizing the global energy sector and reaching net-zero emissions by 2050.

Recommended citation: Chen, B.; Sargent, E. H. What Does Net Zero by 2050 Mean to the Solar Energy Materials Researcher?. Matter 2022, 5 (5), 1322–1325.
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Regulating Surface Potential Maximizes Voltage in All-Perovskite Tandems

Published in Nature 2023, 613 (7945), 676–681

Diammonium surface treatments achieve uniform spatial distribution of surface potential in 1.79 eV perovskite subcells, increasing quasi-Fermi-level splitting by 90 meV and enabling a certified 27% all-perovskite tandem with a record V_OC of 2.19 V and >86% PCE retention after 500 h.

Recommended citation: Chen, H.^†; Maxwell, A.^†; Li, C.^†; Teale, S.^†; Chen, B.^†; Zhu, T.; Ugur, E.; Harrison, G.; Grater, L.; Wang, J.; Wang, Z.; Zeng, L.; Park, S. M.; Chen, L.; Serles, P.; Awni, R. A.; Subedi, B.; Zheng, X.; Xiao, C.; Podraza, N. J.; Filleter, T.; Liu, C.; Yang, Y.; Luther, J. M.; De Wolf, S.; Kanatzidis, M. G.; Yan, Y.; Sargent, E. H. Regulating Surface Potential Maximizes Voltage in All-Perovskite Tandems. Nature 2023, 613 (7945), 676–681.
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Bimolecularly Passivated Interface Enables Efficient and Stable Inverted Perovskite Solar Cells

Published in Science 2023, 382 (6672), 810–815

A sulfur-modified methylthio molecule provides chemical defect passivation through strong coordination and hydrogen bonding, while a diammonium molecule repels minority carriers via field-effect passivation, together yielding a certified 25.1% quasi-steady-state PCE and stable operation at 65 °C for >2000 h in ambient air.

Recommended citation: Liu, C.; Yang, Y.; Chen, H.; Xu, J.; Liu, A.; Bati, A. S. R.; Zhu, H.; Grater, L.; Hadke, S. S.; Huang, C.; Sangwan, V. K.; Cai, T.; Shin, D.; Chen, L. X.; Hersam, M. C.; Mirkin, C. A.; Chen, B.^*; Kanatzidis, M. G.^*; Sargent, E. H.^* Bimolecularly Passivated Interface Enables Efficient and Stable Inverted Perovskite Solar Cells. Science 2023, 382 (6672), 810–815.
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A Three-Dimensional Quantum Dot Network Stabilizes Perovskite Solids via Hydrostatic Strain

Published in Matter 2024, 7 (1), 107–122

Lattice-mismatched perovskite quantum dots embedded in a perovskite matrix generate homogeneous hydrostatic compressive strain as confirmed by GIWAXS, improving the operational stability of 1.77 eV wide-bandgap solar cells to >90% PCE retention after 200 h of one-sun MPP tracking.

Recommended citation: Liu, Y.; Zhu, T.; Grater, L.; Chen, H., dos Reis, R.; Maxwell, A.; Cheng, M.; Dong, Y.; Teale, S.; Leontowich, A. F. G.; Kim, C.-Y.; Chan, P. T.-S.; Wang, M.; Paritmongkol, W.; Gao, Y.; Park, S. M.; Xu, J.; Khan, J. I.; Laquai, F.; Walker, G. C.; Dravid, V. P.; Chen, B.^*; Sargent, E. H.^* A Three-Dimensional Quantum Dot Network Stabilizes Perovskite Solids via Hydrostatic Strain. Matter 2024, 7 (1), 107–122.
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A Thermotropic Liquid Crystal Enables Efficient and Stable Perovskite Solar Modules

Published in Nature Energy 2024, 9 (3), 316–323

Thermotropic liquid crystal additives with melting points below perovskite processing temperatures avoid co-precipitation and enable spatially uniform defect passivation, yielding certified 21.1% stabilized efficiency at 31 cm² aperture area and T86 of 1200 h under ISOS-D-3 damp-heat conditions.

Recommended citation: Yang, Y.; Liu, C.; Ding, Y.; Ding, B.; Xu, J.; Liu, A.; Yu, J.; Grater, L.; Zhu, H.; Hadke, S.; Sangwan, V.; Bati, A. S. R.; Hu, X.; Li, J.; Park, S. M.; Hersam, M.; Chen, B.^*; Nazeeruddin, M.^*; Kanatzidis, M. G.^*; Sargent, E. H.^* A Thermotropic Liquid Crystal Enables Efficient and Stable Perovskite Solar Modules. Nature Energy 2024, 9 (3), 316–323.
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All-Perovskite Tandems Enabled by Surface Anchoring of Long-Chain Amphiphilic Ligands

Published in ACS Energy Letters 2024, 9 (2), 520–527

Oleic acid treatment of Pb–Sn perovskite surfaces coordinates Sn²⁺ sites and reduces interfacial recombination, lowering the V_OC deficit to 0.34 V and enabling certified 26.4% all-perovskite tandem solar cells with a V_OC of 2.21 V.

Recommended citation: Maxwell, A.; Chen, H.; Grater, L.; Li, C.; Teale, S.; Wang, J.; Zeng, L.; Wang, Z.; Park, S. M.; Vafaie, M.; Sidhik, S.; Metcalf, I. W.; Liu, Y.; Mohite, A. D.; Chen, B.^*; Sargent, E. H.^* All-Perovskite Tandems Enabled by Surface Anchoring of Long-Chain Amphiphilic Ligands. ACS Energy Lett. 2024, 9 (2), 520–527.
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The Dynamic Adsorption Affinity of Ligands Is a Surrogate for the Passivation of Surface Defects

Published in Nature Communications 2024, 15 (1), 2035

Ab initio molecular dynamics simulations uncover a reversible hydrogen-vacancy degradation mechanism at perovskite surfaces and reveal that dynamic adsorption affinity—rather than static binding energy—is the key predictor of passivation efficacy, guiding design of targeted ligands for enhanced photovoltaic stability.

Recommended citation: Xu, J.; Maxwell, A.; Song, Z.; Bati, A. S. R.; Chen, H.; Li, C.; Park, S. M.; Yan, Y.; Chen, B.^*; Sargent, E. H.^* The Dynamic Adsorption Affinity of Ligands Is a Surrogate for the Passivation of Surface Defects. Nature Communications 2024, 15 (1), 2035.
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Improved Charge Extraction in Inverted Perovskite Solar Cells with Dual-Site-Binding Ligands

Published in Science 2024, 384 (6692), 189–193

Ligands designed to bind two neighboring Pb²⁺ defect sites in a planar orientation reduce steric resistance at the perovskite surface, achieving a certified 26.15% quasi-steady-state PCE (24.74% for 1.04 cm²) with 95% PCE retention after 1200 h of continuous 1-sun MPP operation at 65 °C.

Recommended citation: Chen, H.; Liu, C.; Xu, J.; Maxwell, A.; Zhou, W.; Yang, Y.; Zhou, Q.; Bati, A. S. R.; Wan, H.; Wang, Z.; Zeng, L.; Wang, J.; Serles, P.; Liu, Y.; Teale, S.; Liu, Y.; Saidaminov, M. I.; Li, M.; Rolston, N.; Hoogland, S.; Filleter, T.; Kanatzidis, M. G.; Chen, B.^*; Ning, Z.^*; Sargent, E. H.^* Improved Charge Extraction in Inverted Perovskite Solar Cells with Dual-Site-Binding Ligands. Science 2024, 384 (6692), 189–193.
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Diamine Chelates for Increased Stability in Mixed Sn–Pb and All-Perovskite Tandem Solar Cells

Published in Nature Energy 2024, 9 (11), 1388–1396

Diamines selectively chelate surface Sn atoms in mixed Sn–Pb perovskite films to correct a Sn-rich compositional gradient, forming a low-dimensional passivating barrier that enables 28.8% PCE tandem solar cells retaining 90% efficiency after 1000 h of MPP operation under 1-sun illumination.

Recommended citation: Li, C.; Chen, L.; Jiang, F.; Song, Z.; Wang, X.; Balvanz, A.; Ugur, E.; Liu, Y.; Liu, C.; Maxwell, A.; Chen, H.; Liu, Y.; Wang, Z.; Xia, P.; Li, Y.; Fu, S.; Sun, N.; Grice, C. R.; Wu, X.; Fink, Z.; Hu, Q.; Zeng, L.; Jung, E.; Wang, J.; Park, S. M.; Luo, D.; Chen, C.; Shen, J.; Han, Y.; Perini, C. A. R.; Correa-Baena, J.-P.; Lu, Z.-H.; Russell, T. P.; De Wolf, S.; Kanatzidis, M. G.; Ginger, D. S.; Chen, B.^*; Yan, Y.^*; Sargent, E. H.^* Diamine Chelates for Increased Stability in Mixed Sn–Pb and All-Perovskite Tandem Solar Cells. Nature Energy 2024, 9 (11), 1388–1396.
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Amidination of Ligands for Chemical and Field-Effect Passivation Stabilizes Perovskite Solar Cells

Published in Science 2024, 386 (6724), 898–902

Amidinium ligands exploit resonance-enhanced N–H bonds to resist deprotonation under light and thermal stress, reducing the deprotonation equilibrium constant >10-fold and enabling certified 26.3% PCE with ≥90% PCE retention after 1100 h of continuous 1-sun MPP operation at 85 °C.

Recommended citation: Yang, Y.; Chen, H.; Liu, C.; Xu, J.; Huang, C.; Malliakas, C. D.; Wan, H.; Bati, A. S. R.; Wang, Z.; Reynolds, R. P.; Gilley, I. W.; Kitade, S.; Wiggins, T. E.; Zeiske, S.; Suragtkhuu, S.; Batmunkh, M.; Chen, L. X.; Chen, B.^*; Kanatzidis, M. G.^*; Sargent, E. H.^* Amidination of Ligands for Chemical and Field-Effect Passivation Stabilizes Perovskite Solar Cells. Science 2024, 386 (6724), 898–902.
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Carboxyl-Functionalized Perovskite Enables ALD Growth of a Compact and Uniform Ion Migration Barrier

Published in Joule 2025, 9 (3), 101801

5-AVAI carboxyl groups on the perovskite surface act as ALD nucleation templates, enabling compact Al₂O₃ growth at 100 °C and a 10× reduction in halide migration into the C₆₀ ETL, with 1.78 eV cells retaining 90% PCE after 1000 h of continuous operation at 55 °C.

Recommended citation: Choi, D.; Shin, D.; Li, C.; Liu, Y.; Bati, A. S. R.; Kachman, D. E.; Yang, Y.; Li, J.; Lee, Y. J.; Li, M.; Penukula, S.; Kim, D. B.; Shin, H.; Chen, C.-H.; Park, S. M.; Liu, C.; Maxwell, A.; Wan, H.; Rolston, N.; Sargent, E. H.^*; Chen, B.^* Carboxyl-Functionalized Perovskite Enables ALD Growth of a Compact and Uniform Ion Migration Barrier. Joule 2025, 9 (3), 101801.
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A Chemically Bonded Monolayer Interface Enables Enhanced Thermal Stability and Efficiency in Pb-Sn Perovskite Solar Cells

Published in Joule 2025, 9 (9), 102047

Bifunctional 16-MHDA SAMs bearing thiol groups establish robust S–Pb chemical coordination at the Pb–Sn perovskite buried interface, improving fracture energy by 30%, doubling photocarrier lifetime, and enabling 24% PCE single-junction cells with T80 > 680 h under 1-sun illumination at 50 °C.

Recommended citation: Bati, A. S. R.; Liu, C.; Gilley, I. W.; Musgrave III, C. B.; Maxwell, A.; Steele, J. A.; Yang, Y.; Chen, H.; Wan, H.; Xu, J.; Solano, E.; Zhang, R.; Huang, C.; Rehl, B.; Lempesis, N.; Carnevali, V.; Vezzosi, A.; Zeng, L.; Grater, L.; Li, M.; Rolston, N.; Choi, D.; Slama, V.; Rothlisberger, U.; Wang, L.; Goddard III, W. A.; Kanatzidis, M. G.; Chen, B.^*; Bakr, O. M.^*; Sargent, E. H.^* A Chemically Bonded Monolayer Interface Enables Enhanced Thermal Stability and Efficiency in Pb-Sn Perovskite Solar Cells. Joule 2025, 9 (9), 102047.
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Electrostatically Enhanced Buried Interface Binding of Self-Assembled Monolayers for Efficient and Stable Inverted Perovskite Solar Cells

Published in Advanced Materials 2025, 37 (43), e202508740

The donor-acceptor SAM PAFTB, with its enhanced dipole moment and tailored anchoring groups, strengthens electrostatic interactions at the TCO/perovskite buried interface 2.8× relative to 2PACz, yielding certified 24.9% quasi-steady-state PCE with 80% efficiency retention after 900 h of MPP tracking at 85 °C.

Recommended citation: Huang, C.; Yang, Y.; Liu, C.; Chen, H.; Chaudhuri, S.; Jeon, W. C.; Li, M.; Rolston, N.; Bati, A. S. R.; Gilley, I. W.; Kumral, B.; Serles, P.; Filleter, T.; Schatz, G. C.; Kanatzidis, M. G.; Chen, B.^*; Chen, L. X.^*; Sargent, E. H.^* Electrostatically Enhanced Buried Interface Binding of Self-Assembled Monolayers for Efficient and Stable Inverted Perovskite Solar Cells. Advanced Materials 2025, 37 (43), e202508740.
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Revealing Additional Size-Dependent Defect Suppression Channels Governing Detectivity in InAs Colloidal Quantum Dot Photodiodes

Published in Nano Letters 2025, 25 (48), 16862–16868

HDR-EQE measurements of InAs CQD photodiodes reveal that trap densities decrease with increasing nanocrystal size beyond simple surface-to-volume scaling, and that today’s devices are primarily limited by contact and interface properties rather than intrinsic trap-mediated recombination.

Recommended citation: Zeiske, S.; Ban, H. W.; Li, X.; Deng, B., López-Arteaga, R.; Kazianga, U. H.; Han, M. G.; Kim, T.-G.; Chen, B.^*; Sargent, E. H.^* Revealing Additional Size-Dependent Defect Suppression Channels Governing Detectivity in InAs Colloidal Quantum Dot Photodiodes. Nano Letters 2025, 25 (48), 16862–16868.
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teaching

Teaching experience 1

Undergraduate course, University 1, Department, 2014

This is a description of a teaching experience. You can use markdown like any other post.

Teaching experience 2

Workshop, University 1, Department, 2015

This is a description of a teaching experience. You can use markdown like any other post.

Bin Chen

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