作者:Chuanyu Jiang、Ping Liu、Wenji Deng
DOI:10.1080/00397910802654849
日期:2009.6.9
For the purpose of developing novel photovoltaic materials, 5,5''-biformyl-2,2':5',2''-terthiophene (OHC-3T-CHO) and 5,5''''-biformyl-2,2':5',2'':5'',2''':5''',2''''-q-uinquethiophene (OHC-5T-CHO) were synthesized. The photovoltaic properties of OHC-3T-CHO and OHC-5T-CHO were studied. We have fabricated two flexible organic photovoltaic devices using OHC-3T-CHO, OHC-5T-CHO, and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). The PET-ITO (indium tin oxides coated with polyethylene terephthalate)/OHC-3T-CHO/PTCDA/Al device has an open circuit voltage (Voc) of 1.12V, and photoelectric conversion efficiency (PCE) of 1.00%, whereas the PET-ITO/OHC-5T-CHO/PTCDA/Al device has a Voc of 1.78V and PCE of 1.08%. Both devices have high Voc (1.12V and 1.78V). It is possible that intermolecular hydrogen bonding between the -CHO group of OHC-nT-CHO and the carboxylic dianhydride of PTCDA enhanced the efficiency by promoting forward interfacial electron transfer.