The conversion efficiency (η) of organic solar cells (OSCs) constructed with ITO/ZnO/P3HT:PCBM/PEDOT:PSS/Ag is improved by incorporating Al into ZnO films (AZO) as electron transport layers (ETLs). Compared with ZnO films, AZO-based OSCs enhance η by ∼13.9% via improving short-circuit photocurrent density from 10.73 to 11.12 mA cm-2 and fill factor from 53.7% to 60.8%. Doping Al into ZnO ETLs not only optimizes band alignment between organic active layers and ETLs and increases carrier concentration, conductivity, and bandgap of ZnO films facilitating more light into OSCs but also improves the absorption of P3HT by promoting the molecular ordering of P3HT.
Bibliographical noteFunding Information:
This work was supported by National Science Council of Taiwan (99-2622-E-002-019-CC3, 99-2112-M-002-024-MY3, 101-2622-E-002-012-CC3, and 99-2120-M-007-011) and National Taiwan University (10R70823).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)