Atomic layer deposition is used to synthesize Al 2O 3:ZnO(1:x) nanolaminates with the number of deposition cycles, x, ranging from 5 to 30 for evaluation as optically transparent, electron-selective electrodes in polymer-based inverted solar cells. Al 2O 3:ZnO(1:20) nanolaminates are found to exhibit the highest values of electrical conductivity (1.2 × 10 3 S cm -1; more than six times higher than for neat ZnO films), while retaining a high optical transmittance (â¥80% in the visible region) and a low work function (4.0 eV). Such attractive performance is attributed to the structure (ZnO crystal size and crystal alignment) and doping level of this intermediate Al 2O 3:ZnO film composition. Polymer-based inverted solar cells using poly(3-hexylthiophene) (P3HT):phenyl-C 61-butyric acid methyl ester (PCBM) mixtures in the active layer and Al 2O 3:ZnO(1:20) nanolaminates as transparent electron-selective electrodes exhibit a power conversion efficiency of 3% under simulated AM 1.5 G, 100 mW cm -2 illumination.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics