Perovskite solar cells with 18.21% efficiency and area over 1 cm2 fabricated by heterojunction engineering

Yongzhen Wu, Xudong Yang, Wei Chen, Youfeng Yue, Molang Cai, Fengxian Xie, Enbing Bi, Ashraful Islam and Liyuan Han ()
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Yongzhen Wu: Photovoltaic Materials Unit, National Institute for Materials Science
Xudong Yang: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
Wei Chen: Photovoltaic Materials Unit, National Institute for Materials Science
Youfeng Yue: Photovoltaic Materials Unit, National Institute for Materials Science
Molang Cai: Photovoltaic Materials Unit, National Institute for Materials Science
Fengxian Xie: Photovoltaic Materials Unit, National Institute for Materials Science
Enbing Bi: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University
Ashraful Islam: Photovoltaic Materials Unit, National Institute for Materials Science
Liyuan Han: Photovoltaic Materials Unit, National Institute for Materials Science

Nature Energy, 2016, vol. 1, issue 11, 1-7

Abstract: Abstract Perovskite solar cells (PSCs) are promising low-cost photovoltaic technologies with high solar-to-electric power conversion efficiency (PCE). The heterojunction structure between perovskite and charge extraction layers is crucial to the photovoltaic performance of PSCs. Here, we report efficient inverted-structured PSCs with a perovskite–fullerene graded heterojunction (GHJ), in which the electron-accepting material is distributed in the perovskite layer with a gradient. This structure can enhance the PCE as it improves the photoelectron collection and reduces recombination loss, especially for the formamidinium cation-based perovskite. The conformal fullerene coating on perovskite during the GHJ deposition achieves a full coverage with reduced layer thickness, thus minimizing the resistive loss in larger sized devices. Our strategy enables the fabrication of centimetre-scale PSCs showing high efficiency with small hysteresis and good stability. A PCE of 18.21% was certified by an independent institution for cells with an aperture area of 1.022 cm2.

Date: 2016
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DOI: 10.1038/nenergy.2016.148

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