Lead-Free Flexible Perovskite Solar Cells with Interfacial Native Oxide Have >10% Efficiency and Simultaneously Enhanced Stability and Reliability

Chen, Min; Dong, Qingshun; Xiao, Chuanxiao; Zheng, Xiaopeng; Dai, Zhengdong; Shi, Yantao; Luther, Joseph M.; Padture, Nitin P.

doi:10.1021/acsenergylett.2c01130

Title: Lead-Free Flexible Perovskite Solar Cells with Interfacial Native Oxide Have >10% Efficiency and Simultaneously Enhanced Stability and Reliability

Journal Article · 08 June 2022 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.2c01130· OSTI ID:1880083

Chen, Min; Dong, Qingshun; Xiao, Chuanxiao; Zheng, Xiaopeng; Dai, Zhengdong; Shi, Yantao;

; Padture, Nitin P.

Here we demonstrate an innovative compositional and interfacial engineering approach to achieve Pb-free flexible perovskite solar cells (f-PSCs) with an unprecedented combination of the highest efficiency reported to date (10.43%), together with enhanced operational stability and mechanical reliability. The key to this approach is alloying of an FASnI3 metal halide perovskite (MHP) thin film with Ge2+ to stabilize the Sn2+ oxidation state in the MHP, together with the use of a NiOx hole-transport layer. We show that this results in the in situ formation of a thin amorphous GeO2 native oxide layer at the NiOx/FASn0.9Ge0.1I3 interface. This layer not only passivates that critical interface but also enhances the interfacial mechanical bonding.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 1880083

Report Number(s):: NREL/JA-5900-83146; MainId:83919; UUID:6c2f77fc-15a9-46cb-94e9-b8b19c64866d; MainAdminID:65000

Journal Information:: ACS Energy Letters, Vol. 7, Issue 7

Country of Publication:: United States

Language:: English

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