4.8 Article

Light Processing Enables Efficient Carbon-Based, All-Inorganic Planar CsPbIBr2 Solar Cells with High Photovoltages

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 3, Pages 2997-3005

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17839

Keywords

inorganic perovskites; CsPbIBr2; light processing; open-circuit voltage; all-inorganic perovskite solar cells

Funding

  1. National Natural Science Foundation of China [61334002, 61804113, 61874083]
  2. Fundamental Research Funds for the Central Universities [JB181107, JBX171103]
  3. National Natural Science Foundation of Shaanxi Province [2018ZDCXL-GY-08-02-02, 2017JM6049]
  4. Innovation Fund of Xidian University [1020415001]

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Inorganic halide perovskite CsPbIBr2 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 CsPbIBr2 solar cells seem to deliver the lowest record efficiency. This is originally plagued by a serious energy loss (E-loss) in the cells, which thus limits their open-circuit voltages (V-oc) severely. Herein, we demonstrate a light processing technology that can overcome this obstacle successfully, by enabling the full-coverage, pure-phase CsPbIBr2 films featured with large grains, high crystallinity, and preferential [100] grains orientation, along with favorable electronic structure. It is achieved by the exposure of CsPbIBr2 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 V-oc of 1.283 V. Notably, such an impressive V-oc stands the highest value among all of the previously reported CsPbIBr2 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 CsPbIBr2 solar cells.

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