Efficient and carbon-based hole transport layer-free CsPbI2Br planar perovskite solar cells using PMMA modification
- 1 March 2019
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry C
- Vol. 7 (13), 3852-3861
- https://doi.org/10.1039/c9tc00374f
Abstract
In this work, planar inorganic perovskite solar cells (PSCs) with the simple structure of glass/ITO/SnO2/CsPbI2Br/C have been fabricated. Solution-processed poly(methyl methacrylate) (PMMA) is selected to modify the CsPbI2Br film. The effects of PMMA modification on the microstructure of the CsPbI2Br film and the photoelectric properties of inorganic PSCs have been systematically investigated. The concentration of the PMMA solution has been optimized. At the optimal concentration, the modified carbon-based hole transport layer (HTL)-free CsPbI2Br PSCs demonstrate an improved open-circuit voltage (Voc) and fill factor (FF), and achieve a champion efficiency of 10.95% with less hysteresis behavior, this being much higher than the 9.14% of the reference PSCs. Moreover, the unencapsulated CsPbI2Br PSCs modified by PMMA demonstrate improved stability and retain about 95% of their initial efficiency after being exposed to air (relative humidity of 25–35%) for 20 days. The enhanced performance is mainly attributed to the reduced trap state density and suppressed charge recombination. This work provides a simple route to fabricate efficient and stable carbon-based HTL-free inorganic PSCs.Keywords
Funding Information
- National Natural Science Foundation of China (51431006, 51472093, 61574065, 51571094)
- Natural Science Foundation of Guangdong Province (2016A030313421, 2016A030308019)
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