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.
Ping LiuTu Hua ChenWan Zhang PanMing Sheng HuangWen Ji DengYu Liang MaiAn Bo Luan
For the purpose of developing organic photovoltaic devices with good performance characteristics,we have fabricated twodevices using 4T-CHO,5T-CHO and PTCDA.The ITO/4T-CHO/PTCDA/Al device has a V_oc of 2.45 V and photoelectricconversion efficiency of 2.76%.The ITO/5T-CHO/PTCDA/Al device has a V_oc of 2.1 3V and photoelectric conversion efficiency of2.90%.The two devices have higher Voc(2.45 and 2.13 V).It is possible that intermolecular hydrogen bonding between-CHOgroup of nT-CHO and carboxylic dianhydride of PTCDA contribute to enhance the efficiency by promoting interfacial electrontransfer and eliminating the subconducting band trap sites.
Ping LiuJia Le HuangWan Zhang PanMing Sheng HuangWen Ji DengYu Liang MaiAn Bo Luan
