Method for regulating crystal face growth in perovskite crystallization process and application thereof in preparation of solar cells

Abstract

The application belongs to the technical field of perovskite solar cells, and particularly relates to a method for regulating crystal face growth in a perovskite crystallization process and application thereof in preparation of solar cells. Chloroformamidine hydrochloride (ClFACl) is doped into a perovskite precursor solution, so that the crystal face growth in the perovskite crystallization process is regulated. The final concentration of chloroformamidine hydrochloride in the perovskite precursor solution is 0.3-3.5 mg / ml. The application uses chloroformamidine hydrochloride as a crystal face regulator of the perovskite precursor solution, regulates the perovskite crystal face selectivity through an in-situ nucleophilic substitution reaction, induces the perovskite crystal to selectively grow along the (001) crystal face, improves the perovskite thin film crystallization quality, reduces the thin film defects, and suppresses the non-radiative recombination. The application makes the precursor solution nucleation homogeneous by introducing ClFACl, suppresses the generation of impurity phases, promotes the conversion of intermediate phases to alpha phases, and finally improves the photoelectric performance and stability of the device.

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