CAJ | 학술논문

首次将染料分子3-乙基绕丹宁连接到[6，6]-苯基-C61-丁酸甲酯（PCBM）上，合成了具有增强光吸收性能的新型富勒烯受体光伏材料PCBRh．通过1HNMR，13CNMR和质谱分析确定了PCBRh的结构，紫外-可见吸收光谱测试表明所合成的PCBRh在300～600nm比起PCBM具有更强的光吸收，这归因于3-乙基绕丹宁高的吸光系数．电化学测试表明PCBRh的最低未占轨道（LUMO）能级比PCBM高0.1eV，这是由绕丹宁基团的给电子作用引起的．将PCBRh作为受体光伏材料与聚己基噻吩（P3HT）共混构建出体相异质结太阳能电池，在优化的制备工艺（P3HT/PCBRh＝1：1（质量比），135℃热处理10min）下，电池器件的能量转换效率为1．46％．通过AFM表征研究退火处理对光活性层的形貌的影响及其与电池器件效率的联系：与参比P3HT：PCBM共混薄膜相比，退火处理使P3HT：PCBRh薄膜中的P3HT聚集成长度约为20nm的长条，并且粗糙度较大，因此不利于激子的扩散与分离．
수차장염료분자3-을기요단저련접도[6，6]-분기-C61-정산갑지（PCBM）상，합성료구유증강광흡수성능적신형부륵희수체광복재료PCBRh．통과1HNMR，13CNMR화질보분석학정료PCBRh적결구，자외-가견흡수광보측시표명소합성적PCBRh재300～600nm비기PCBM구유경강적광흡수，저귀인우3-을기요단저고적흡광계수．전화학측시표명PCBRh적최저미점궤도（LUMO）능급비PCBM고0.1eV，저시유요단저기단적급전자작용인기적．장PCBRh작위수체광복재료여취기기새분（P3HT）공혼구건출체상이질결태양능전지，재우화적제비공예（P3HT/PCBRh＝1：1（질량비），135℃열처리10min）하，전지기건적능량전환효솔위1．46％．통과AFM표정연구퇴화처리대광활성층적형모적영향급기여전지기건효솔적련계：여삼비P3HT：PCBM공혼박막상비，퇴화처리사P3HT：PCBRh박막중적P3HT취집성장도약위20nm적장조，병차조조도교대，인차불리우격자적확산여분리．
A dye unit ,3-ethyl rhodanine ,was attached onto (6 ,6)-phenyl-C61 butyric acid methyl ester (PCBM ) for the first time ,affording a new fullerene acceptor PCBM-rhodanine (PCBRh) for polymer solar cells (PSCs) with enhanced light absorption .The successful attachment of the rhodanine moiety was confirmed by 1 H NMR ,13 C NMR and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF ) mass spectroscopies . UV-vis spectroscopic study indicated that PCBRh had stronger absorptions in the region of 300~600 nm than PCBM ,and this was due to the high absorption coefficient of the dye unit of 3-ethyl rhodanine . Cyclic voltammetric measurement revealed that the lowest unoccupied molecular orbital (LUMO) level of PCBRh was 0 .1 eV higher than that of PCBM ,which can be understood by considering the electron donating property of the rhodanine moiety .Using PCBRh as an acceptor blending with poly(3-hexylthiophene-2 ,5-diyl) (P3HT) ,the bulk heterojunction (BHJ) PSC device exhibited a power conversion efficiency (PCE) of 1.46% under the optimized condition (blending ratio of P3HT :PCBM = 1 :1 (mass ratio ) ,annealing treatment at 135 ℃ for 10 min) . The effect of annealing on the morphology of P3HT :PCBRh active layer and its correlation with the device performance were studied by atomic force microscopy (AFM ) , revealing that in the annealed P3HT :PCBRh blend film P3HT aggregated to long stripes with an average length of ca .20 nm and the RMS roughness increased compared to that for the reference P3HT :PCBM blend film , thus leading to unfavorable exciton diffusion and dissociation .