AI Article Synopsis
- Perovskite solar cells (PSCs) are emerging as a promising photovoltaic technology due to their high efficiency, but Pb toxicity poses environmental concerns for large-scale use.
- Researchers are exploring bismuth (Bi) as a safer alternative to lead in PSCs and have developed a new bismuth-based perovskite, CsBiSCl, for this purpose.
- The CsBiSCl PSCs demonstrated a power conversion efficiency of 10.38% and maintained 97% of efficiency after 150 days, indicating strong potential for stability and commercial viability without lead.
Article Abstract
Perovskite solar cells (PSCs) have become a new photovoltaic technology with great commercial potential because of their excellent photovoltaic performance. However, the toxicity and poor environmental stability of Pb in Pb-based perovskites limit its large-scale application. Exploring alternatives to Pb is an available approach to develop environmentally friendly PSCs. As an adjacent element of Pb, Bi shows many similar physical and chemical properties; therefore, it is commonly applied for B site substitution in Pb-based PSCs. CsBiSCl, a new Pb-free perovskite system, was synthesized for the first time as a light absorber. By preparing DMABiS as an intermediate, Cs-Bi-based CsBiSCl perovskite films with a band gap over 2.012 eV were prepared by introducing CsCl, and the optimal annealing temperature, time, and stoichiometric ratio of the film were explored in this work. The conventional structure of CsBiSCl PSCs achieved a power conversion efficiency (PCE) of 10.38%, and the efficiency declined by only 3% after aging in air for 150 days, showing excellent stability, which is one of the most stable devices in inorganic PSCs. This work opens up a new road for the future development of environmentally friendly and commercially stable lead-free PSCs.
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| http://dx.doi.org/10.1021/acs.jpclett.4c00310 | DOI Listing |
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