Nature Communications
Nature Communications
5 years ago

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

Diffusion engineering of ions and charge carriers for stable efficient perovskite solar cells
Michael Grätzel, Yongzhen Wu, Enbing Bi, Liyuan Han, Yanjie Su, Xudong Yang, Ashraful Islam, Wei Chen, Fengxian Xie, Han Chen
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.

Publisher URL: http://www.nature.com/articles/ncomms15330

DOI: 10.1038/ncomms15330

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