Researchers in Japan succeeded in producing highly reproducible and highly stable perovskite solar cells by a low-temperature solution process.
The results were published the Journal of Materials Chemistry A issued by the Royal Society of Chemistry (UK).
The ad hoc Team on Perovskite PV Cells (Team Leader: Kenjiro Miyano) of the Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN) at the National Institute for Materials Science (NIMS) succeeded in producing highly reproducible and highly stable perovskite solar cells by using a low-temperature solution process, which is essential for realizing next-generation solar cells with such characteristics as low-cost, lightweight and flexible (Figure).
Conventional perovskite solar cells produced by a low-temperature solution process had problems in terms of stability and reproducibility, and details of their operational mechanism were difficult to clarify. In this research, the team newly developed a chlorine-mediated interdiffusion method, in which chlorine is added in the process of forming perovskite crystals, and realized high-efficiency perovskite solar cells having the following excellent characteristics by using a low-temperature solution process.
- A process temperature of less than 140°C at the most (high compatibility with flexible substrates, etc.)
- Excellent stability exhibiting consistent output characteristics for a long period
- Excellent durability maintaining stable output characteristics even under continuous light exposure for about two hours
- Highly reliable output characteristics and reproducibility exhibiting consistent conversion efficiency irrespective of the voltage sweep direction, etc.
Use of a low-temperature solution process makes it possible to produce solar cells with lightweight and flexible substrates such as plastic. In addition, the realization of highly stable, durable, and reproducible devices based on this research result enables detailed analysis of the operation of the devices even under continuous light exposure. Therefore, elucidation of the operational mechanism, which had been difficult in the past, is expected to advance remarkably toward practical application of perovskite solar cells.
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