AI Article Synopsis
- α-CsPbI3, ideal for all-inorganic perovskite solar cells, struggles with phase instability in cold, humid conditions.
- Researchers improved stability by using excess CsI during synthesis and enhancing film quality by doping with Sb.
- The resulting CsPb0.96Sb0.04I3 exhibited a power conversion efficiency of 5.18% and maintained 93% of its efficiency after 37 days in the air, indicating a successful strategy for more stable solar cells.
Article Abstract
α-CsPbI3 with the most suitable band gap for all-inorganic perovskite solar cell (PSC) application faces an issue of phase instability at low temperature in an air atmosphere. Herein, through stoichiometric investigation, α-CsPbI3 is successfully obtained with excess CsI at 110 °C in an air atmosphere. By doping α-CsPbI3 with Sb, phase stability is further enhanced and the film morphology is also improved. Carbon-based perovskite solar cells (C-PSCs) based on CsPb0.96Sb0.04I3 achieve a promising power conversion efficiency (PCE) of 5.18%, a record value for α-CsPbI3-based PSCs without hole transport materials. Significantly, the CsPb0.96Sb0.04I3 C-PSCs retain 93% of the initial PCE after 37 days of storage in an air atmosphere. Therefore, the synergistic effect of non-stoichiometry and Sb-doping presents a promising strategy to design all-inorganic lead halide PSCs with high performance and stability.
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| http://dx.doi.org/10.1039/c7nr09657g | DOI Listing |
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