New Hybrid Hole Extraction Layer of Perovskite Solar Cells with a Planar p–i–n Geometry

• Published in: Journal of physical chemistry. C Vol. 119; no. 49; pp. 27285 - 27290
• Main Authors: Park, Ik Jae, Park, Min Ah, Kim, Dong Hoe, Park, Gyeong Do, Kim, Byeong Jo, Son, Hae Jung, Ko, Min Jae, Lee, Doh-Kwon, Park, Taiho, Shin, Hyunjung, Park, Nam-Gyu, Jung, Hyun Suk, Kim, Jin Young
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 10.12.2015
• Subjects: hole-extraction layer; impedance spectroscopic analysis; MATERIALS SCIENCE; perovskite solar cells; photoluminescence; quenching; SOLAR ENERGY
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.5b09322

We report a highly efficient p–i–n type planar perovskite solar cell with a hybrid PEDOT/NiO x hole-extraction layer. It has been found that the perovskite solar cell with a NiO x thin film as a hole-extraction layer generally exhibits lower fill factor compared to the conventionally used PEDOT:PSS thin film, whereas it shows higher photocurrent and photovoltage. The fill factor of the NiO x -based perovskite solar cell can be significantly improved by treating the NiO x surface with a dilute PEDOT solution. The photoluminescence quenching study and impedance spectroscopic (IS) analysis have revealed that the hole injection at the perovskite/NiO x interface is significantly facilitated with the PEDOT treatment, which should lead to the increased fill factor. As a result, the p–i–n type planar perovskite solar cell with the new hybrid hole-extraction layer exhibits a high conversion efficiency of 15.1% without the hysteresis effect.