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For the purpose of developing flexible organic photovoltaic devices, we have fabricated two flexible devices using 5-formyl- 2,20:50,200:500,2000-quaterthiophene (4T-CHO), 5-formyl-2,20:50, 200:500,2000:5000,20000-quinquethiophene (5T-CHO) and 3,4,9,10-peryle- netertracarboxylic dianhydride (PTCDA). The PET-ITO/4T-CHO/PTCDA/Al device has an open circuit voltage (Voc) of 1.56 V, photoelectric conversion efficiency of 0.77%. The PET-ITO/5T-CHO/PTCDA/Al device has a Voc of 1.70 V, photoelectric conversion efficiency of 0.84%. The two flexible devices have high Voc (1.56 and 1.70 V). It is possible that intermolecular hydrogen bonding between-CHO group of nT-CHO and carboxylic dianhydride of PTCDA contributes to enhancing the efficiency by promoting interfacial electron transfer and eliminating the subconducting band trap sites.
For the purpose of developing flexible organic photovoltaic devices, we have fabricated two flexible devices using 5-formyl-2,20: 50,200: 500,2000-quaterthiophene (4T-CHO) 500: 2000: 5000, 20,000-quinquethiophene (5T-CHO) and 3,4,9,10-peryle-netertracarboxylic dianhydride (PTCDA). The PET-ITO / 4T-CHO / PTCDA / Al device has an open circuit voltage Voc) of 1.56 V, the photoelectric conversion efficiency of 0.77%. The PET-ITO / 5T-CHO / PTCDA / Al device has a Voc of 1.70 V, the photoelectric conversion efficiency of 0.84%. The two flexible devices have high Voc (1.56 and 1.70 V). It is possible that intermolecular hydrogen bonding between-CHO group of nT-CHO and carboxylic dianhydride of PTCDA contributes to enhance the efficiency by promoting interfacial electron transfer and eliminating the subconducting band trap sites.