Chinese researchers develop new gas-solid perovskite process

In another attempt at cracking the perovskite stability problem, scientists from China’s Liaocheng University and Hefei University of Technology have developed a new gas-solid process for the creation of perovskite thin films, which they say can lead to improved stability and response time.

Solvent based processes, the most common method for growing perovskite crystals on a substrate, often leads to defects and irregularities in the perovskite film.

Image: Dr. Guoqing Tong

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The efficiency potential for perovskite materials in solar is well known, and researchers the world over are working on a plethora of different methods to improve their stability and create solar cells able to stand up to field conditions for longer periods of time.

Researchers from two Chinese Universities – Liaocheng University and Hefei University of Technology – noted that solvent based processes, the most common method for growing perovskite crystals on a substrate, often leads to defects and irregularities in the perovskite film, making it extremely sensitive to moisture and likely to decompose quickly under working conditions.

The researchers then suggested an alternative to using solvents, working on a gas-solid reaction process. Further details of the process itself were not provided, however the team states that crystals grown this way, and annealed at 120∘C for 30 minutes exhibited higher responsivity and detectivity than devices previously developed using solution based methods.

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The paper, published in the journal, Nano, showed that the gas-solid method gave full coverage with a high rate of crystallization, as well as good stability after storage in air for two months.

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