Elucidating Mechanisms behind Ambient Storage-Induced Efficiency Improvements in Perovskite Solar Cells

被引：67
作者：
Cho, Yongyoon [1 ,2 ]
Kim, Hyung Do [2 ]
Zheng, Jianghui [1 ,3 ,4 ]
Bing, Jueming [1 ,3 ,4 ]
Li, Yong [1 ]
Zhang, Meng [1 ]
Green, Martin A. [1 ]
Wakamiya, Atsushi [5 ]
Huang, Shujuan [1 ,6 ]
Ohkita, Hideo [2 ]
Ho-Baillie, Anita W. Y. [1 ,3 ,4 ]
机构：
[1] Univ New South Wales, Australian Ctr Adv Photovolta ACAP, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia
[2] Kyoto Univ, Grad Sch Engn, Dept Polymer Chem, Kyoto 6158510, Japan
[3] Univ Sydney, Univ Sydney Nano Inst, Sydney, NSW 2006, Australia
[4] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
[5] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan
[6] Macquarie Univ, Sch Engn, Sydney, NSW 2109, Australia
来源：
ACS ENERGY LETTERS | 2021年 / 6卷 / 03期
基金：
日本科学技术振兴机构;
关键词：
OPEN-CIRCUIT VOLTAGE; HIGHLY EFFICIENT; HIGH-PERFORMANCE; HYBRID PEROVSKITE; LITHIUM-SALTS; SPIRO-OMETAD; STABILITY; DOPANT; OXIDE; DEGRADATION;
D O I：
10.1021/acsenergylett.0c02406
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Initial improvement in power conversion efficiency (PCE) during ambient storage is often seen in perovskite solar cells (PSCs). In this work, we studied the origin of PCE enhancement by ambient storage on typical n-i-p PSCs. We found improvements in both fill factor and open-circuit voltage during the first 2 days of storage. By analyzing temperature and light intensity-dependent V-OC, we found that the charge recombination mechanism changed from surface- to bulk-dominated because of defect passivation at the perovskite surface upon storage. In addition, we found that storage improves the conductivity and lowers the highest occupied molecular orbital level of the spiro-OMeTAD, improving charge extraction. These results show that there is more than one factor causing the storage-induced improvements in perovskite solar cells.
引用
收藏
页码：925 / 933
页数：9
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