TY - JOUR
T1 - Chemo-thermal surface dedoping for high-performance tin perovskite solar cells
AU - Zhou, Jianheng
AU - Hao, Mingwei
AU - Zhang, Yu
AU - Ma, Xue
AU - Dong, Jianchao
AU - Lu, Feifei
AU - Wang, Jie
AU - Wang, Ning
AU - Zhou, Yuanyuan
N1 - Funding Information:
Y.Z. and M.H. acknowledge start-up grants, the Interdisciplinary Matching Scheme 2020/21 and the Initiation Grant-Faculty Niche Research Areas (IG-FNRA) 2020/21 of HKBU, and the Early Career Scheme (No. 22300221 ) from the Hong Kong Research Grant Council . M.H. also acknowledges the support of the Hong Kong PhD Fellowship Scheme. N.W. acknowledges financial support from the National Natural Science Foundation of China (No. 51972137 ), the Science and Technology Planning Project of Jilin Province (No. 20190201306JC ), and the excellent youth faculty program and start-up funding from Jilin University .
Publisher Copyright:
© 2021 Elsevier Inc.
PY - 2022/2/2
Y1 - 2022/2/2
N2 - Removing the lead (Pb) from state-of-the-art perovskite solar cells (PSCs) while maintaining high power conversion efficiencies (PCEs) is a prominent step toward full commercialization. The field has identified tin (Sn) PSCs as a promising alternative, but the performance of these Sn PSCs are limited primarily by detrimental Sn(IV) self-doping. Herein, we demonstrate Sn PSCs with PCEs up to 14.7% via a surface-dedoping approach. This method features the chemo-thermal removal of Sn(IV) self-dopants that are found mainly accumulated on the surface of Sn perovskite thin films, and its optimization can avoid negative effects on film morphology. Using this method, we show about a 3-fold enhancement in carrier lifetime and a 2-fold reduction in trap density, underpinning the device's efficiency improvement. The Sn PSCs are also stable, with a 92% PCE retention after 1,000 h of storage in a nitrogen-filled glovebox. This work paves a way for PSCs to achieve their technological potential without Pb involvement.
AB - Removing the lead (Pb) from state-of-the-art perovskite solar cells (PSCs) while maintaining high power conversion efficiencies (PCEs) is a prominent step toward full commercialization. The field has identified tin (Sn) PSCs as a promising alternative, but the performance of these Sn PSCs are limited primarily by detrimental Sn(IV) self-doping. Herein, we demonstrate Sn PSCs with PCEs up to 14.7% via a surface-dedoping approach. This method features the chemo-thermal removal of Sn(IV) self-dopants that are found mainly accumulated on the surface of Sn perovskite thin films, and its optimization can avoid negative effects on film morphology. Using this method, we show about a 3-fold enhancement in carrier lifetime and a 2-fold reduction in trap density, underpinning the device's efficiency improvement. The Sn PSCs are also stable, with a 92% PCE retention after 1,000 h of storage in a nitrogen-filled glovebox. This work paves a way for PSCs to achieve their technological potential without Pb involvement.
KW - dedoping
KW - chemo-thermal approach
KW - lead-free perovskite
KW - tin perovskite photovoltaic
KW - stability
UR - http://www.scopus.com/inward/record.url?scp=85123722524&partnerID=8YFLogxK
U2 - 10.1016/j.matt.2021.12.013
DO - 10.1016/j.matt.2021.12.013
M3 - Article
VL - 5
SP - 683
EP - 693
JO - Matter
JF - Matter
SN - 2590-2393
IS - 2
ER -
