Interfacial Energy Level Tuning for Efficient and Thermostable CsPbI2Br Perovskite Solar Cells

被引：83

作者：

Shen, En-Chi ^{[1
]}

Chen, Jing-De ^{[1
]}

Tian, Yu ^{[1
]}

Luo, Yu-Xin ^{[1
]}

Shen, Yang ^{[1
]}

Sun, Qi ^{[1
]}

Jin, Teng-Yu ^{[1
]}

Shi, Guo-Zheng ^{[1
]}

Li, Yan-Qing ^{[1
,2
]}

Tang, Jian-Xin ^{[1
,3
]}

机构：

[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China

[2] East China Normal Univ, Sch Phys & Elect Sci, Minist Educ, Nanophoton & Adv Instrument Engn Res Ctr, Shanghai 200062, Peoples R China

[3] JITRI, IOO, Suzhou 215215, Peoples R China

来源：

ADVANCED SCIENCE | 2020年 / 7卷 / 01期

基金：

中国国家自然科学基金;

关键词：

all-inorganic perovskite solar cells; energy level alignment; flexible perovskite solar cells; thermal stability; HIGHLY EFFICIENT; PERFORMANCE; HETEROJUNCTION; PHASE; STABILITY; ZNO;

D O I：

10.1002/advs.201901952

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Inorganic mixed-halide CsPbX3-based perovskite solar cells (PeSCs) are emerging as one of the most promising types of PeSCs on account of their thermostability compared to organic-inorganic hybrid counterparts. However, dissatisfactory device performance and high processing temperature impede their development for viable applications. Herein, a facile route is presented for tuning the energy levels and electrical properties of sol-gel-derived ZnO electron transport material (ETM) via the doping of a classical alkali metal carbonate Cs2CO3. Compared to bare ZnO, Cs2CO3-doped ZnO possesses more favorable interface energetics in contact with the CsPbI2Br perovskite layer, which can reduce the ohmic loss to a negligible level. The optimized PeSCs achieve an improved open-circuit voltage of 1.28 V, together with an increase in fill factor and short-circuit current. The optimized power conversion efficiencies of 16.42% and 14.82% are realized on rigid glass substrate and flexible plastic substrate, respectively. A high thermostability can be simultaneously obtained via defect passivation at the Cs2CO3-doped ZnO/CsPbI2Br interface, and 81% of the initial efficiency is retained after aging for 200 h at 85 degrees C.

引用

页数：9

共 42 条

[41] Bication lead iodide 2D perovskite component to stabilize inorganic α-CsPbI3 perovskite phase for high-efficiency solar cells [J].