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Light Processing Enables Efficient Carbon-Based, All-Inorganic Planar CsPbIBr<sub>2</sub> Solar Cells with High Photovoltages

By Qianni Zhang (3339777), Weidong Zhu (316428), Dazheng Chen (3704149), Zeyang Zhang (4763469), Zhenhua Lin (648762), Jingjing Chang (1666951), Jincheng Zhang (1925317), Chunfu Zhang (586761) and Yue Hao (1261215)


Inorganic halide perovskite CsPbIBr<sub>2</sub> possesses the most balanced band gap and stability characters among all of the concerned analogs for carbon-based, all-inorganic solar cells that are free of any hole-transporting layers and noble-metal electrodes. Yet, the current CsPbIBr<sub>2</sub> solar cells seem to deliver the lowest record efficiency. This is originally plagued by a serious energy loss (<i>E</i><sub>loss</sub>) in the cells, which thus limits their open-circuit voltages (<i>V</i><sub>oc</sub>) severely. Herein, we demonstrate a light-processing technology that can overcome this obstacle successfully, by enabling the full-coverage, pure-phase CsPbIBr<sub>2</sub> films featured with large grains, high crystallinity, and preferential [100] grains orientation, along with favorable electronic structure. It is achieved by the exposure of CsPbIBr<sub>2</sub> precursor film formed in a conventional one-step spin-coating route to a simulated AM 1.5 G illumination before thermal annealing. The resulting carbon-based, all-inorganic planar cells give an optimized power conversion efficiency (PCE) of 8.60% with the <i>V</i><sub>oc</sub> of 1.283 V. Notably, such an impressive <i>V</i><sub>oc</sub> stands the highest value among all of the previously reported CsPbIBr<sub>2</sub> solar cells; hence, its PCE exceeds nearly all of them. Therefore, our work suggests a new route to further improve the efficiency of low-cost, stable, and simple-fabrication CsPbIBr<sub>2</sub> solar cells

Topics: Biophysics, Microbiology, Molecular Biology, Neuroscience, Biotechnology, Ecology, Cancer, Space Science, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, optimized power conversion efficiency, PCE, CsPbIBr 2 precursor film, halide perovskite CsPbIBr 2, light Processing Enables Efficient Carbon-Based, V oc, simple-fabrication CsPbIBr 2, CsPbIBr 2, All-Inorganic Planar CsPbIBr 2 Solar Cells, pure-phase CsPbIBr 2 films, AM 1.5 G illumination
Year: 2018
DOI identifier: 10.1021/acsami.8b17839.s001
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