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Interfacial Energy Level Tuning for Efficient and Thermostable CsPbI 2 Br Perovskite Solar Cells
Inorganic mixed-halide CsPbX -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...
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Published in: | Advanced science 2020-01, Vol.7 (1), p.1901952 |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Inorganic mixed-halide CsPbX
-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 Cs
CO
. Compared to bare ZnO, Cs
CO
-doped ZnO possesses more favorable interface energetics in contact with the CsPbI
Br 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 Cs
CO
-doped ZnO/CsPbI
Br interface, and 81% of the initial efficiency is retained after aging for 200 h at 85 °C. |
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ISSN: | 2198-3844 2198-3844 |
DOI: | 10.1002/advs.201901952 |