Liu Xia, Wang Lei, Liu Xi, Li Shuangcui, Liu Zhihai, Chen Ping
School of Physics and Electronic Information, Yantai University, Yantai 264005, China.
School of Artificial Intelligence, Beijing Technology and Business University, Beijing, 100048, China.
Phys Chem Chem Phys. 2024 Sep 11;26(35):23487-23494. doi: 10.1039/d4cp02513j.
In this study, we developed a flexible cathode for fabricating high-performance ternary organic solar cells (OSCs). With solvent engineering and acid treatment, the conductivity of the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) electrode was significantly enhanced with the sheet resistance reduced from 1081 to 83 Ω sq. After being coated with polyethylenimine, work function of the PEDOT:PSS electrode was tuned from -5.07 to -4.12 eV, which is beneficial for electron collection in OSCs. With this technique, the OSCs (on glass) showed an average power conversion efficiency (PCE) of 16.3%, which is comparable to that of conventional inverted OSCs with commonly used indium-tin oxide and sol-gel-processed zinc oxide. However, the processing temperature of the inverted OSCs was dramatically lowered from 200 to 120 °C. The flexible OSCs (on polyethylene naphthalate/PEDOT:PSS/PEIE) exhibited a high PCE of 14.1%. After being bended for 300 cycles, the PCE was only degraded by 8.5%, indicating the excellent bendability of the flexible OSCs with the organic cathode.
在本研究中，我们开发了一种用于制造高性能三元有机太阳能电池（OSC）的柔性阴极。通过溶剂工程和酸处理，聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）电极的电导率显著提高，方阻从1081Ω/sq降至83Ω/sq。在用聚乙烯亚胺包覆后，PEDOT:PSS电极的功函数从-5.07 eV调整到-4.12 eV，这有利于OSC中的电子收集。采用该技术，（在玻璃上的）OSC的平均功率转换效率（PCE）为16.3%，与使用常用氧化铟锡和溶胶-凝胶法氧化锌的传统倒置OSC相当。然而，倒置OSC的加工温度从200℃大幅降低至120℃。柔性OSC（在聚萘二甲酸乙二醇酯/PEDOT:PSS/PEIE上）表现出14.1%的高PCE。在弯曲300次循环后，PCE仅下降了8.5%，表明具有有机阴极的柔性OSC具有优异的可弯曲性。
