講演情報
[21p-C601-19]Environment-friendly and High-stability n-i-p Solar Cells Based on Full Inorganic AgBiS2 Absorber
〇(PC)Ludmila Cojocaru1, Ajay Kumar Jena2, Tsutomu Miyasaka1 (1.Toin University of Yokohama, 2.The University of Tokyo)
キーワード：
all inorganic lead-free solar cells、simple processes、AgBiS2
The current issues that are impeding the commercialization of lead-based perovskite solar cells are stability under operating conditions and the toxicity of lead. Appropriate passivation and compositional control of perovskite absorbers, device interfaces, and architecture are being reported to improve the stability but the Pb-toxicity remains a challenge. According to the European Union, RoHS directive, the maximum accepted weight concentration of lead in homogeneous materials is 1000 mg of lead per kg of the total material. The amount of Pb in the solar cells can vary depending on the thickness of the substrate used to assemble solar cells. In order to decrease the lead amount, many works have been devoted to the development of lead-free absorbers. Bi is a naturally occurring metal and has already been applied in photovoltaics for the interconnection of heterojunction solar cells due to its low melting point. Many cosmetics and pharmaceuticals also contain bismuth, which is approved by the US FDA. It is therefore interesting to further investigate Bi-based photovoltaic materials for lower toxicity and environmental impact. Recently, we found that a simple spin-coating of AgBiS2, can result in a PCE over 4%, endorsing great potential of AgBiS2 as a solution-processible absorber for low-cost, efficient, stable and environmentally friendly solar cells.