Incorporating Potassium Citrate to Improve the Performance of Tin-Lead Perovskite Solar Cells

被引：63

作者：

Chen, Lei ^{[1
,2
]}

Li, Chongwen ^{[1
,2
]}

Xian, Yeming ^{[1
,2
]}

Fu, Sheng ^{[1
,2
]}

Abudulimu, Abasi ^{[1
,2
]}

Li, Deng-Bing ^{[1
,2
]}

Friedl, Jared D. ^{[1
,2
]}

Li, You ^{[1
,2
]}

Neupane, Sabin ^{[1
,2
]}

Tumusange, Marie Solange ^{[1
,2
]}

Sun, Nannan ^{[1
,2
]}

Wang, Xiaoming ^{[1
,2
]}

Ellingson, Randy J. ^{[1
,2
]}

Heben, Michael J. ^{[1
,2
]}

Podraza, Nikolas J. ^{[1
,2
]}

Song, Zhaoning ^{[1
,2
]}

Yan, Yanfa ^{[1
,2
]}

机构：

[1] Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA

[2] Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA

来源：

ADVANCED ENERGY MATERIALS | 2023年 / 13卷 / 32期

关键词：

all-perovskite tandem solar cells; buried interface; defect passivation; low-bandgap perovskites; HALIDE PEROVSKITES; EFFICIENCY; STABILITY;

D O I：

10.1002/aenm.202301218

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：

Easy-to-form tin vacancies at the buried interface of tin-lead perovskites hinder the performance of low-bandgap perovskite solar cells (PSCs). Here, a synergistic strategy by incorporating potassium citrate (PC) into the poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hole-transport layer to passivate the buried interface of Sn-Pb PSCs is reported. PC neutralizes the acidity of PEDOT:PSS and stabilizes the perovskite front surface, enhancing device stability. Citrate moieties coordinate with Sn2+ on the buried perovskite surface, preventing Sn2+ oxidation and suppressing defect formation. Additionally, potassium cations incorporate into Sn-Pb perovskites, enhancing crystallinity and passivating halide defects. The combined benefits enable efficient low-bandgap Sn-Pb PSCs with a power conversion efficiency of 22.7% and a high open-circuit voltage of 0.894 V. Using this method, 26.1% efficiency for all-perovskite tandem solar cells is demonstrated. These results emphasize the significance of buried interface passivation in developing efficient and stable Sn-Pb PSCs and all-perovskite tandem solar cells.

引用

页数：8

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