人工晶体学报, 2020, 49 (9): 1590, 网络出版: 2020-11-11  

基于硫氰酸亚铜的n-i-p型钙钛矿太阳电池界面能级匹配及稳定性的初步研究

Preliminary Study on Interface Energy Level Alignment and Stability of n-i-p Type Perovskite Solar Cells Based on CuSCN
侯世欣 1,2,3崔兴华 1,2,3王鹏阳 1,2,3,*黄茜 1,2,3丁毅 1,2,3李跃龙 1,2,3张德坤 1,2,3赵颖 1,2,3张晓丹 1,2,3
作者单位
1 南开大学,光电子薄膜器件与技术研究所,天津 300350
2 天津市光电子薄膜器件与技术重点实验室,天津 300350
3 教育部薄膜光电子技术工程中心,天津 300350
摘要
宽带隙的无机空穴传输材料硫氰酸亚铜(CuSCN)具有低成本、高载流子迁移率、良好的稳定性,以及优异的光透过性等优点,是一种非常有潜力的空穴传输层材料。但是目前基于CuSCN空穴传输层的n-i-p型钙钛矿太阳电池(PSCs)的光电转换效率(PCE)比基于spiro-OMeTAD的电池效率低很多,其主要原因为电池的开路电压较低。本研究团队发现钙钛矿吸收层带隙对基于CuSCN的电池开路电压有较大的影响,本文分别制备了基于带隙为1.55 eV,1.60 eV以及1.65 eV的钙钛矿太阳电池,其中基于CuSCN 的器件的效率分别为12.8%,14.4%,10.7%(基于spiro-OMeTAD的钙钛矿太阳电池效率分别为20.8%,19.1%和17.5%)。通过研究发现1.60 eV带隙的钙钛矿能够与CuSCN空穴传输层(HTL)之间形成较好的界面能级匹配,获得最高的效率,电池的开路电压能够达到1.06 V,电池PCE为14.4%。更重要的是在相对湿度(RH)30%~40%的空气中,未封装的基于CuSCN HTL钙钛矿太阳电池经过120 ℃处理1 h后仍能够保持原来性能的92.4%,而基于spiro-OMeTAD HTL钙钛矿太阳电池只能保持原来性能的49.7%。这表明基于CuSCN的n-i-p型钙钛矿太阳电池具有良好的热稳定性,是制备稳定钙钛矿太阳电池的理想空穴传输材料之一。
Abstract
The copper thiocyanate (CuSCN) is an inorganic hole transport material with wide-bandgap low cost, high carrier mobility, good stability and excellent light transmittance which has great potential for hole transport layer. However, the current power conversion efficiency (PCE) of the n-i-p type perovskite solar cell (PSCs) based on CuSCN is much lower than that based on spiro-OMeTAD. The main reason is that the PSCs with low open-circuit voltage. It is found that the band gap of the perovskite absorber layer has a great impact on open-circuit voltage of PSCs. PSCs with different band gap 1.55 eV, 1.60 eV and 1.65 eV were fabricated, the PCE of devices based on CuSCN are 12.8%, 14.4% and 10.7%, respectively (The PCE of devices based on Spiro are 20.8%, 19.1% and 17.5%, respectively). The PSCs with a band gap of 1.60 eV form a better energy level alignment with CuSCN and the device with open-circuit voltage of 1.06 V can be achieved. The PCE of champion device is 14.4%. What’s more, when PSCs are exposed to the air with a relative humidity (RH) of 30% to 40%, the unencapsulated PSCs based on CuSCN maintains 92.4% of its initial power conversion efficiency (PCE) at 120 ℃ for 1 h. In a contrast, the device based on spiro-OMeTAD only matains 49.7% of its initial efficiency. It demonstrated that PSCs based on CuSCN with good thermal stability in n-i-p structure devices, which is an ideal hole transport material for stable devices.

侯世欣, 崔兴华, 王鹏阳, 黄茜, 丁毅, 李跃龙, 张德坤, 赵颖, 张晓丹. 基于硫氰酸亚铜的n-i-p型钙钛矿太阳电池界面能级匹配及稳定性的初步研究[J]. 人工晶体学报, 2020, 49(9): 1590. HOU Shixin, CUI Xinghua, WANG Pengyang, HUANG Qian, DING Yi, LI Yuelong, ZHANG Dekun, ZHAO Ying, ZHANG Xiaodan. Preliminary Study on Interface Energy Level Alignment and Stability of n-i-p Type Perovskite Solar Cells Based on CuSCN[J]. Journal of Synthetic Crystals, 2020, 49(9): 1590.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!