Abstract
We demonstrate high-efficiency organic photovoltaic cells by stacking two hybrid planar-mixed molecular heterojunction cells in series. Absorption of incident light is maximized by locating the subcell tuned to absorb long-wavelength light nearest to the transparent anode, and tuning the second subcell closest to the reflecting metal cathode to preferentially absorb short-wavelength solar energy. Using the donor, copper phthalocyanine, and the acceptor, C 60, we achieve a maximum power conversion efficiency of η P=(5.7±0.3)% under 1 sun simulated AM1.5G solar illumination. An open-circuit voltage of V OC ≤ 1.2 V is obtained, doubling that of a single cell. Analytical models suggest that power conversion efficiencies exceeding 6.5% can be obtained by this architecture.
Original language | English (US) |
---|---|
Pages (from-to) | 5757-5759 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 85 |
Issue number | 23 |
DOIs | |
State | Published - Dec 6 2004 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)