Characterizations and Understanding of Additives Induced Passivation Effects in Narrow-Bandgap Sn-Pb Alloyed Perovskite Solar Cells

被引：9
|
作者：
Yang, Yang Michael [1 ]
Chen, Xinya [1 ]
Liu, Shaocong [1 ]
Zhu, Haiming [1 ]
Wang, Wensheng [1 ]
Kuang, Cuifang [1 ]
Liu, Xu [1 ]
机构：
[1] Zhejiang Univ, Coll Opt Sci & Engn, Inst Adv Photon, Key Lab Excited State Mat Zhejiang Prov,State Key, Hangzhou 310027, Zhejiang, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2021年 / 125卷 / 23期
基金：
浙江省自然科学基金;
关键词：
CHARGE-TRANSPORT; EFFICIENCY; LENGTHS; FILMS; LIMIT;
D O I：
10.1021/acs.jpcc.1c03213
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：
Narrow-bandgap Sn-Pb alloyed perovskite solar cells have higher SQ limits than the widely studied lead based perovskites, but they often suffer from more severe energy losses. Pb(SCN)(2) and SnF2 additives were widely used in those narrow-bandgap perovskite solar cells, but the underlying mechanisms were not much understood yet. Here, we employed spatially and time-resolved spectroscopies to investigate the additive effects. We find the SnF2 additive mainly works as morphology modifiers, while Pb(SCN)(2) plays little roles in film formation but significantly alters the charge carriers dynamic especially at grain boundaries and eliminates the density of defect states. A small device with power conversion efficiency (PCE) of 18.1% and fill factor as high as 82.4% were realized by the synergetic effects of SnF2 and Pb(SCN)(2) additives, and a large area mini module device with 15.5% PCE was also successfully demonstrated.
引用
收藏
页码：12560 / 12567
页数：8
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