title: Effect of film thickness in hybrid polymer/polymer solar cells with zinc oxide nanoparticles.
abstract: We briefly report the effect of film thickness on the performance of hybrid polymer/polymer solar cells that were made using poly(3-hexylthiophene), poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT), and zinc oxide (ZnO) nanoparticles. The ZnO nanoparticles were introduced to improve the electron transport property of P3HT/F8BT blend films. Results showed that the open circuit voltage (V(OC)) was remarkably decreased by adding only approximately 0.5 wt% ZnO nanoparticles though the optical absorption spectra were not much changed due to the small amount of ZnO nanoparticles in the ternary blend films (approximately 1.9%). In contrast, the fill factor (FF) of devices was improved for the ternary blend devices with the ZnO nanoparticles due to the improved electron transport as evidenced by the reduced series resistance. The short circuit current density of devices was not much changed because of the enhanced charge transport. However, the addition of ZnO nanoparticles decreased the power conversion efficiency of devices owing to the larger influence of V(OC) compared to the FF improvement.
authors: Organic Nanoelectronics Laboratory, Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors: Sungho
authors: S
authors: Nam
authors: Joonhyeon
authors: J
authors: Kim
authors: Hwajeong
authors: H
authors: Kim
authors: Youngkyoo
authors: Y
authors: Kim