水杨酸的添加对全无机锡铅混合钙钛矿太阳能电池的影响

人工晶体学报 ›› 2022, Vol. 51 ›› Issue (8): 1387-1395.

水杨酸的添加对全无机锡铅混合钙钛矿太阳能电池的影响

卢辉, 李彤, 温谦, 沙思淼, 马思敏, 薛晓洋, 王康, 盛之林, 马金福

北方民族大学材料科学与工程学院,宁夏硅靶及硅碳负极材料工程技术研究中心,银川 750021

收稿日期:2022-05-09 出版日期:2022-08-15 发布日期:2022-09-08
作者简介:卢辉(1988—),男,宁夏回族自治区人,博士。E-mail:luhui@nmu.edu.cn
基金资助:
宁夏自然科学基金(2020AAC03196);北方民族大学研究生创新项目(YCX21120)

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

LU Hui, LI Tong, WEN Qian, SHA Simiao, MA Simin, XUE Xiaoyang, WANG Kang, SHENG Zhilin, MA Jinfu

Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology, School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China

Received:2022-05-09 Online:2022-08-15 Published:2022-09-08

摘要/Abstract

摘要： 全无机钙钛矿太阳能电池(PSCs)因其优异的光电转换效率和高的环境稳定性而被广大学者关注,但Pb元素的使用对环境危害较大限制了其进一步应用。尽管科研人员目前在努力寻找一种危害较小的元素替代铅,但无铅钙钛矿仍然比含铅钙钛矿更易分解,性能也更低。本文采用Sn部分取代Pb制备得到全无机锡铅混合钙钛矿薄膜,并通过添加一定量的水杨酸从而抑制Sn²⁺氧化为Sn⁴⁺,达到稳定相态提升电池光电转换效率的目的。结果表明随着水杨酸的添加量由2 mg·mL^-1增加至6 mg·mL^-1,器件的光电转换效率先增大后降低。通过SEM、XRD、XPS等测试结果发现,当添加量为4 mg·mL^-1时,薄膜相稳定性最好,与不添加水杨酸的器件相比,其短路电流密度(J_sc)从14.7 mA·cm^-2显著提高至15.1 mA·cm^-2,光电转换效率由5.8%提高至6.5%。此外,最优器件在空气环境中存放5 d后,初始光电转换效率仍可保持原有效率的50％,进一步表明水杨酸的添加对锡铅混合钙钛矿相稳定性的提升具有一定的促进作用。

关键词: 锡铅混合, 全无机钙钛矿, 太阳能电池, 水杨酸, 相稳定性, 光电性能, 光电转换效率

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

中图分类号:

卢辉, 李彤, 温谦, 沙思淼, 马思敏, 薛晓洋, 王康, 盛之林, 马金福. 水杨酸的添加对全无机锡铅混合钙钛矿太阳能电池的影响[J]. 人工晶体学报, 2022, 51(8): 1387-1395.

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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