Abstract
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.
Original language | English (US) |
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Pages (from-to) | 1531-1538 |
Number of pages | 8 |
Journal | Advanced Functional Materials |
Volume | 22 |
Issue number | 7 |
DOIs | |
State | Published - Apr 10 2012 |
Externally published | Yes |
Keywords
- Al O :ZnO nanolaminates
- atomic layer deposition
- inverted organic solar cells
- oriented growth
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Chemistry
- Condensed Matter Physics
- General Materials Science
- Electrochemistry
- Biomaterials