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

Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2020-01-11)
En-Chi Shen, Jing-De Chen, Yu Tian, Yu-Xin Luo, Yang Shen, Qi Sun, Teng-Yu Jin, Guo-Zheng Shi, Yan-Qing Li, Jian-Xin Tang
ABSTRACT

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 °C.

MATERIALS
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Sigma-Aldrich
2-Methoxyethanol, anhydrous, 99.8%
Sigma-Aldrich
Chlorobenzene, suitable for HPLC, 99.9%