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18.77 % Efficiency Organic Solar Cells Promoted by Aqueous Solution Processed Cobalt(II) Acetate Hole Transporting Layer
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-08-21 , DOI: 10.1002/anie.202110550
Huifeng Meng 1 , Chentong Liao 1 , Min Deng 1 , Xiaopeng Xu 1 , Liyang Yu 1 , Qiang Peng 1
Affiliation  

A robust hole transporting layer (HTL), using the cost-effective Cobalt(II) acetate tetrahydrate (Co(OAc)2⋅4 H2O) as the precursor, was simply processed from its aqueous solution followed by thermal annealing (TA) and UV-ozone (UVO) treatments. The TA treatment induced the loss of crystal water followed by oxidization of Co(OAc)2⋅4 H2O precursor, which increased the work function. However, TA treatment differently realize a high work function and ideal morphology for charge extraction. The resulting problems could be circumvented easily by additional UVO treatment, which also enhanced the conductivity and lowered the resistance for charge transport. The optimal condition was found to be a low temperature TA (150 °C) followed by simple UVO, where the crystal water in Co(OAc)2⋅4 H2O was removed fully and the HTL surface was anchored by substantial hydroxy groups. Using PM6 as the polymer donor and L8-BO as the electron acceptor, a record high PCE of 18.77 % of the binary blend OSCs was achieved, higher than the common PEDOT:PSS-based solar cell devices (18.02 %).

中文翻译:

由水溶液处理的醋酸钴 (II) 空穴传输层促进的 18.77 % 效率的有机太阳能电池

使用具有成本效益的四水合醋酸钴 (II) (Co(OAc) 2 ⋅4 H 2 O) 作为前驱体的坚固的空穴传输层 (HTL)从其水溶液中简单地加工出来,然后进行热退火 (TA)和紫外线臭氧 (UVO) 处理。TA 处理导致结晶水流失,随后 Co(OAc) 2 ⋅4 H 2氧化O 前体,它增加了功函数。然而,TA 处理以不同的方式实现了高功函数和理想的电荷提取形态。由此产生的问题可以通过额外的 UVO 处理轻松解决,这也增强了导电性并降低了电荷传输的电阻。发现最佳条件是低温 TA (150 °C),然后是简单的 UVO,其中 Co(OAc) 2 ⋅4 H 2 O中的结晶水被完全去除,HTL 表面被大量羟基固定。使用 PM6 作为聚合物供体和 L8-BO 作为电子受体,实现了 18.77% 的二元混合物 OSCs 的创纪录高 PCE,高于常见的基于 PEDOT:PSS 的太阳能电池设备 (18.02%)。
更新日期:2021-09-27
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