Diffusion engineering of ions and charge carriers for stable efficient perovskite solar cells

Enbing Bi, Han Chen, Fengxian Xie, Yongzhen Wu, Wei Chen, Yanjie Su, Ashraful Islam, Michael Grätzel (), Xudong Yang () and Liyuan Han ()
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Enbing Bi: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University
Han Chen: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University
Fengxian Xie: Photovoltaic Materials Unit, National Institute for Materials Science
Yongzhen Wu: Photovoltaic Materials Unit, National Institute for Materials Science
Wei Chen: Photovoltaic Materials Unit, National Institute for Materials Science
Yanjie Su: Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University
Ashraful Islam: Photovoltaic Materials Unit, National Institute for Materials Science
Michael Grätzel: Laboratory of Photonics and Interfaces (LPI), Station 6, Institute of Chemical Science and Engineering, Faculty of Basic Science, Ecole Polytechnique Federale de Lausanne
Xudong Yang: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University
Liyuan Han: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Long-term stability is crucial for the future application of perovskite solar cells, a promising low-cost photovoltaic technology that has rapidly advanced in the recent years. Here, we designed a nanostructured carbon layer to suppress the diffusion of ions/molecules within perovskite solar cells, an important degradation process in the device. Furthermore, this nanocarbon layer benefited the diffusion of electron charge carriers to enable a high-energy conversion efficiency. Finally, the efficiency on a perovskite solar cell with an aperture area of 1.02 cm2, after a thermal aging test at 85 °C for over 500 h, or light soaking for 1,000 h, was stable of over 15% during the entire test. The present diffusion engineering of ions/molecules and photo generated charges paves a way to realizing long-term stable and highly efficient perovskite solar cells.

Date: 2017
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DOI: 10.1038/ncomms15330

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