ELUMO = −2.91 eV). Solution processed bulk heterojunction “all-thiophene” solar cells using P3HT as electron donor and the above mentioned oligothiophenes as electron acceptor were fabricated and tested. The highest power conversion efficiency (PCE) of 1.31% was achieved for DTSi-cored compound DTSi(THDCV)2, whereas PTB7:DTSi(THDCV)2 based device showed slightly higher PCE of 1.56%. Electron mobilities of
含有二
噻吩并[3,2- b:2',3'- d ]
硅烷基(D
TSi)的三个2,2-二
氰基
乙烯基(DCV)端基封端的A-π-D-π-A型寡
噻吩(DCV-O
TS)作为中央供体部分的环戊基[1,2- b:3,4- b ']二
噻吩(D
TCP)或二
噻吩并[3,2- b:2',3'- d ]
吡咯(DTPy)单元为中心供体,单
噻吩合成了π共轭桥。对这些化合物的吸收光谱,循环伏安法进行了表征。结果表明,所有这些化合物在500–680 nm范围内都有较强的吸收带,其LUMO能级约为-3.80 eV,略高于[6,6]苯基-C 61-
丁酸甲酯(PC 61BM,E LUMO = -4.01eV),但低于聚(
3-己基噻吩)(P3HT,E LUMO = -2.91eV)。制备并测试了以P3HT为电子供体和上述低聚
噻吩为电子受体的固溶体异质结“全
噻吩”太阳能电池。D
TSi芯复合材料D
TSi(THDCV)2的最高功率转换效率(PCE)为1