High-efficiency inverted polymer solar cells with solution-processed metal oxides
Journal
Solar Energy Materials and Solar Cells
Journal Volume
95
Journal Issue
8
Pages
2511-2515
Date Issued
2011
Author(s)
Lin, Yu-Hong
Yang, Po-Ching
Huang, Jing-Shun
Huang, Guo-Dong
Wang, Ing-Jye
Wu, Wen-Hao
Lin, Ming-Yi
Abstract
The selection of carrier transporting layer in polymer solar cells is an important issue because the nature and direction of carrier transport can be manipulated by inserting different functional layers in the device structure. In this work, we report a very efficient inverted polymer solar cell (PSC) system based on regioregular poly(3-hexylthiophene) and a n-type acceptor, bis-indene[C60]. With a pair of metal oxides and the insertion of TiO2 nanorods electron collecting layer between the ZnO thin film and the active layer, the device efficiency can be greatly improved. The contact area between the active layer and the electron collecting layer, as well as the thickness of active layer, can be increased with the incorporation of TiO 2 nanorods. As a result, photocurrent can be enhanced due to more absorption of light and more charge separation interface. In addition, the larger contact area and the crystalline TiO2 nanorods provide a more efficient transporting route for the carriers to the cathode. The most efficient device demonstrated shows a high power conversion efficiency of 5.6% with the inverted structure. © 2011 Elsevier B.V.
SDGs
Type
journal article