| 초록 |
A simple low temperature for sponteneus formation of nanoripples on ZnO thin films was developed, and these nanostructured ZnO films were used as hole-blocking layer in inverted organic solar cells, Moreover, power conversion efficiency (PCE) vary depending on the temperature of heat treatment. Among various temperatures of heat treatment 180 oC for 10 minute resulted in the best photovoltaic performance of the organic solar cell consisting of a stack of indium tin oxide/ZnO/PTB7 (polythienothiophene-co-benzodithiophenes 7) mixed with PC70BM (phenyl-C71-butyric acid methyl ester) /Ag. The PCE of inverted organic solar cells consisting of with 0.5M ZnO nanoripples (~8.4%) was higher than other heat treatmented ZnO films. Existence of nanoripples on ZnO results in a higher contact area between ZnO and active layer, leading to an enhanced photovoltaic performance. futhermore, existence of amine in the low temperature proceed ZnO film lead to control the band gap of ZnO. finally our fabricated OPV is improved in two aspects. |
