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Highly stable and efficient all-inorganic lead-free perovskite solar cells with native-oxide passivation

https://doi.org/10.1038/s41467-018-07951-y

Chen, Min ; Ju, Ming-Gang ; Garces, Hector F. ; Carl, Alexander D. ; Ono, Luis K. ; Hawash, Zafer ; Zhang, Yi ; Shen, Tianyi ; Qi, Yabing ; Grimm, Ronald L. ; et al ( December 2019 , Nature Communications)

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Charge transport across metal/molecular (alkyl) monolayer-Si junctions is dominated by the LUMO level

https://doi.org/10.1103/PhysRevB.85.045433

Yaffe, Omer ; Qi, Yabing ; Scheres, Luc ; Puniredd, Sreenivasa Reddy ; Segev, Lior ; Ely, Tal ; Haick, Hossam ; Zuilhof, Han ; Vilan, Ayelet ; Kronik, Leeor ; et al ( January 2012 , Physical Review B)
Measurement of high carrier mobility in graphene in an aqueous electrolyte environment

https://doi.org/10.1063/1.4962141

Brown, Morgan A. ; Crosser, Michael S. ; Leyden, Matthew R. ; Qi, Yabing ; Minot, Ethan D. ( August 2016 , Applied Physics Letters)
Improved SnO 2 Electron Transport Layers Solution‐Deposited at Near Room Temperature for Rigid or Flexible Perovskite Solar Cells with High Efficiencies

https://doi.org/10.1002/aenm.201900834

Dong, Qingshun ; Li, Jiangwei ; Shi, Yantao ; Chen, Min ; Ono, Luis K. ; Zhou, Ke ; Zhang, Chunyang ; Qi, Yabing ; Zhou, Yuanyuan ; Padture, Nitin P. ; et al ( May 2019 , Advanced Energy Materials)

Abstract
Electron transport layer (ETL) is a functional layer of great significance for boosting the power conversion efficiency (PCE) of perovskite solar cells (PSCs). To date, it is still a challenge to simultaneously reduce the surface defects and improve the crystallinity in ETLs during their low‐temperature processing. Here, a novel strategy for the mediation of in situ regrowth of SnO₂nanocrystal ETLs is reported: introduction of controlled trace amounts of surface absorbed water on the fluorinated tin oxide (FTO) or indium–tin oxide (ITO) surfaces of the substrates using ultraviolet ozone (UVO) pretreatment. The optimum amount of adsorbed water plays a key role in balancing the hydrolysis–condensation reactions during the structural evolution of SnO₂thin films. This new approach results in a full‐coverage SnO₂ETL with a desirable morphology and crystallinity for superior optical and electrical properties, as compared to the control SnO₂ETL without the UVO pretreatment. Finally, the rigid and flexible PSC devices based on the new SnO₂ETLs yield high PCEs of up to 20.5% and 17.5%, respectively.

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