Carboxymethyldextran sodium-modified SnO2 enables highly efficient and stable perovskite solar cells with a high fill factor of 84.89%†

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Qi Luo, Bowen Li, Chenyu Ju, Hongxin Weng, Hong Zhang, Qihao Dai, Pengfei Liu, Hao Xiong, Kunyuan Zheng, Peng Xiang and Xinyu Tan
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Abstract

SnO2-based perovskite solar cells (PSCs) have made tremendous progress, but there's still a lot of room for optimization of the fill factor (FF) and power conversion efficiency (PCE) compared with the short-circuit current density and open-circuit voltage. The FF is strongly related to carrier extraction and transport efficiency. In this study, a simple method for passivating SnO2 by integrating carboxymethyldextran sodium (CMD) into a SnO2 colloidal mixture is presented. It is shown that the addition of CMD can improve the electronic properties of SnO2, reduce the nonradiative recombination, effectively passivate the defects at the buried interface of SnO2 and perovskite, and make the device form a suitable energy level arrangement. As a result, the efficiency of this SnO2-CMD-based device is increased from 23.09% to 24.73%, and the FF is significantly increased to 84.89%, with negligible hysteresis. At a relative humidity of 20–30% and a temperature of 25 °C, the device retains 86% of its original PCE after 1000 hours of storage. This study provides a low-cost, convenient and efficient method for realizing efficient and stable PSCs.

Abstract Image

羧甲基二葡聚糖钠改性二氧化硒实现高效稳定的 Perovskite 太阳能电池,填充因子高达 84.89
基于二氧化锡的过氧化物太阳能电池(PSCs)已经取得了巨大进步,但与短路电流密度和开路电压相比,填充因子和功率转换效率仍有很大的优化空间。填充因子与载流子萃取和传输效率密切相关。本研究提出了一种通过在二氧化锡胶体混合物中加入羧甲基二葡聚糖钠(CMD)来钝化二氧化锡的简单方法。结果表明,CMD 的加入可以改善二氧化锡的电子特性,减少非辐射重组,有效钝化二氧化锡和过氧化物埋藏界面的缺陷,并使器件形成合适的能级排列。因此,这种基于 SnO2-CMD 的器件的效率从 23.09% 提高到 24.73%,填充因子 (FF) 显著提高到 84.89%,滞后几乎可以忽略不计。在相对湿度为 20 %-30 %、温度为 25 °C 的条件下,该装置在存储 1000 小时后仍能保持 86 % 的原始光电转换效率 (PCE)。这项研究为实现高效、稳定的 PSC 提供了一种低成本、便捷、高效的方法。
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来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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