Effect of Salicylic Acid Additive on the Properties of All-Inorganic Tin-Lead Perovskite Solar Cells

Abstract

Abstract: All-inorganic perovskite solar cells (PSCs) have gained significant attention due to their excellent photoelectric conversion efficiency and high stability. However, Pb-based perovskites are easily decomposed into toxic Pb compounds and are fatal to environment, which limit their further application. Despite the great effort carried out to substitute the Pb by a less hazardous element, lead-free perovskites still remain more unstable than lead-containing perovskites, and present lower performance as well. In this paper, Sn is used to partially replace Pb for obtaining all-inorganic tin-lead perovskite thin film, and salicylic acid is added for inhibiting the oxidation of Sn²⁺ to Sn⁴⁺, so as to achieve the goal of improving photoelectric conversion efficiency cells by a stable phase. The experimental results show that the photoelectric conversion efficiency of the device increases first and then decreases with the increase of the amount of salicylic acid from 2 mg·mL^-1 to 6 mg·mL^-1. Through the tests of SEM, XRD, XPS, it is found that the phase stability of the film is the best when the content of salicylic acid is 4 mg·mL^-1. Compared with the device without salicylic acid, the short-circuit current density (J_sc) increases from 14.7 mA·cm^-2 to 15.1 mA·cm^-2significantly, meanwhile, the photoelectric conversion efficiency increases from 5.8% to 6.5%. In addition, the initial photoelectric conversion efficiency of the best device can still maintain 50% of the original efficiency after 5 d of storage in the air environment, which further proves that the addition of salicylic acid has a certain role in promoting the stability of tin-lead perovskite phase.

Key words: tin-lead mixture, all-inorganic perovskite, solar cell, salicylic acid, phase stability, photoelectric performance, photoelectric conversion efficiency

CLC Number:

LU Hui, LI Tong, WEN Qian, SHA Simiao, MA Simin, XUE Xiaoyang, WANG Kang, SHENG Zhilin, MA Jinfu. Effect of Salicylic Acid Additive on the Properties of All-Inorganic Tin-Lead Perovskite Solar Cells[J]. Journal of Synthetic Crystals, 2022, 51(8): 1387-1395.

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