聚合物添加剂作为形貌调节剂...电池的效率和稳定性（英文）_时宇.pdf

Chem.J.Chinese Universities,2023,44(7),2023004720230047(1/10)CHEMICAL JOURNAL OF CHINESE UNIVERSITIES高 等 学 校 化 学 学 报研究论文聚合物添加剂作为形貌调节剂提升全小分子有机太阳能电池的效率和稳定性时宇1，张榴1，国霞2，王阳1，肖海芹1，房进1，周祎1，张茂杰1，2（1.苏州大学材料与化学化工学部,苏州市新型半导体光电材料与器件重点实验室,苏州 215123；2.山东大学化学与化工学院，国家胶体材料工程技术研究中心,济南 250100）摘要 活性层形貌的调控是实现全小分子有机太阳能电池高效率和稳定性的关键.本文将聚合物给体PM7作为形貌调节剂加入到BTTzR Y6二元体系中,制备了三元全小分子有机太阳能电池.研究结果表明,少量PM7的加入能够有效改善共混膜中的微观纳米结构和分子堆积，促使器件获得更加有效的激子解离和载流子传输；相应器件的短路电流和填充因子显著提升，最终能量转化效率从二元器件的13.9%提高到三元器件的16.0%.值得注意的是，三元器件的热稳定性大幅提升，在85 加热2200 min后依然能够保持初始效率的79%；而二元器件则大幅衰减到初始效率的43%.以上结果表明,添加聚合物添加剂可以有效地调节共混膜形貌,以获得高效和稳定的全小分子有机太阳能电池.关键词 全小分子有机太阳能电池；聚合物添加剂；形貌调控；高效率与稳定性中图分类号 O649 文献标志码 A doi：10.7503/cjcu20230047All-small-molecule Organic Solar Cells with Enhanced Efficiency and Stability Enabled by Polymer Additive as a Morphology ModulatorSHI Yu1，ZHANG Liu1，GUO Xia2*，WANG Yang1，XIAO Haiqin1，FANG Jin1，ZHOU Yi1，ZHANG Maojie1，2*（1.Suzhou Key Laboratory of Novel Semiconductoroptoelectronics Materials and Devices，College of Chemistry，Chemical Engineering and Materials Science，Soochow University，Suzhou 215123，China；2.National Engineering Research Center for Colloidal Materials，School of Chemistry&Chemical Engineering，Shandong University，Jinan 250100，China）Abstract For all-small-molecule organic solar cells（ASM-OSCs），modulating the morphology of active layer has been a challenging and urgent issue to achieve high efficiency and stablity.In this work，a polymer donor PM7 as a morphology modulator was incorporated to a BTTzR Y6 system to fabricate ternary ASM-OSCs.A small amount of PM7 could promote more favourable nanostructure and ordered molecular packing in the blend film，resulting in more efficient excition dissiociation and charge carrier transport in the device.As a result，the optimal ternary devices exhibited a significantly improved power conversion efficiency（PCE）of 16.0%with simultaneously enhanced short circuit current（JSC）and fill factor（FF）compared to the binary devices with a PCE of 13.9%.Notably，after being heated at 85 for 2200 min，the ternary devices still retained 79%of its initial PCE，whereas the binary devices showed larger decay to 43%in the same duration.The results demonstrated that adding the polymer additive can 收稿日期：2023-02-06.网络首发日期：2023-04-07.联系人简介：国 霞,女,博士,教授,主要从事有机光伏材料与器件方面的研究.Email:张茂杰,男,博士,教授,主要从事有机光伏领域方面的研究.E-mail:基金项目：国家自然科学基金(批准号:51973146)和山东省自然科学基金会(批准号:ZR2022JQ09)资助.Supported by the National Natural Science Foundation of China(No.51973146)and the Shandong Provincial Natural Science Foundation,China(No.ZR2022JQ09).CHEMICAL JOURNAL OF CHINESE UNIVERSITIES高 等 学 校 化 学 学 报研究论文Chem.J.Chinese Universities,2023,44(7),2023004720230047(2/10)effectively modulate the blend morphology for highly efficient and stable ASM-OSCs.Keywords All-small-molecule organic solar cell；Polymer additive；Morphology modulator；High efficiency and stability1 IntroductionOrganic solar cells（OSCs）have attracted much attention due to their great advantages of light weight，flexibility and low cost16.Compared with polymer solar cells（PSCs），all-small-molecule organic solar cells（ASM-OSCs），consisting of a small-molecule donor and a small-molecule acceptor，have exhibited some superiorites owing to the features of small molecules，such as their definite chemical structures and molecular weights，easy purification and outstanding batch-to-batch reproducibility710.Up to date，with the development of non-fullerene acceptors（NFAs），the power conversion efficiency（PCE）of ASM-OSCs has already reached over 16%1117 but still lags behind that of PSCs1823.The inferior PCE is mainly caused by the limited conjugation length of small molecule donors，which makes it difficult to form good molecular interconnection，leading to a low short-circuit current density（JSC）and fill factor（FF）in ASM-OSCs24，25.Thus，modulating the morphology of the active layer has been a great challenge to improve the photovoltaic performance of ASM-OSCs.Great efforts have been devoted to modulating the morphological characteristics of active layers，leading to the significant improvement in ASM-OSCs2637.Thermal annealing（TA）and solvent vapor annealing（SVA）are the most common methods for post-treatment，and the combination of the two is also not rare26，27.Ge et al.28 studied the influences of TA and SVA treatment on ASM-OSCs and realized a PCE of 15.4%after careful optimization on SVA time and solvents.Lu et al.29 synthesized an ordered liquid crystalline donor BTR-Cl and achieved a PCE of 13.6%by TA.Zhu et al.30 combined SVA and TA，obtaining a 13.7%efficiency for the devices based on BSFTR Y6.Generally speaking，both TA and SVA are mainly aimed to facilitate molecular crystallization and packing，and thus adjusting phase separation in the active layer.Apart from the post-treatments，the ternary strategy is also an effective approach to promote the PCEs of ASM-OSCs.For example，Hou et al.12 introduced BO-2Cl into B1 BO-4Cl system，BO-2Cl and BO-4Cl formed an alloy-like composite to promote the favorable nanostructure in