Preparation of PCDTBT nanofibers with a diameter of 20 nm and their application to air-processed organic solar cells.
A strategy for fabricating organic photovoltaic (OPV) devices based on PCDTBT nanofibers and PC70BM is described. Electrospinning techniques are used to prepare PCDTBT nanofibers and OPV devices in ambient air. The diameters of the PCDTBT nanofibers are approximately twice the exciton diffusion length, 20 nm. The active layer exhibits 100% photoluminescence quenching due to the small nanofiber diameter, indicating that the excitons are efficiently dissociated. The electrospun PCDTBT nanofibers absorb more photons at longer wavelengths, leading to improved photon harvesting. OPV devices composed of PCDTBT nanofibers show a high short circuit current of 11.54 mA cm(-2) and a high power conversion efficiency of 5.82%. The increase in the short circuit current is attributed to enhanced photon harvesting and charge transport. This method may be applied to the fabrication, in ambient air, of large-area active layers composed of other new conjugated polymers to yield high-performance OPV devices.
Carbon Nanomaterials Design Laboratory, Global Research Laboratory (GRL), Research Institute of Advanced Materials (RIAM), and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea. crpark@snu.ac.kr.
Taehoon
T
Kim
Seung Jae
SJ
Yang
Sung Kyun
SK
Kim
Hong Soo
HS
Choi
Chong Rae
CR
Park
D005898:Glass / Q000737:chemistry; D057139:Nanofibers / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D012993:Solar Energy; D017971:Tin Compounds / Q000737:chemistry
D011108:Polymers; D017971:Tin Compounds; C109984:indium tin oxide