Abstract
Printable, wide band-gap chalcopyrite compound films (CuInGaS2, CIGS) were synthesized on transparent conducting oxide substrates. The wide band-gap and defective nature of the films reveal semi-transparent and bifacial properties that are beneficial for power generating window applications. Importantly, solar cell devices with these films demonstrate a synergistic effect for bifacial illumination resulting in a 5.4-16.3% increase of the apparent power conversion efficiency compared to the simple sum of the efficiencies of the front and rear side illumination only. We also confirmed that this extra output power acquisition due to bifacial irradiation is apparently not influenced by the light intensity of the rear side illumination, which implies that weak light (e.g., indoor light) can be efficiently utilized to improve the overall solar cell efficiency of bifacial devices.
| Original language | English |
|---|---|
| Article number | 4408 |
| Journal | Scientific Reports |
| Volume | 4 |
| DOIs | |
| State | Published - 18 Mar 2014 |
Bibliographical note
Funding Information:This work was supported by a National Research Foundation of Korea Grant (NRF-2009-C1AAA001-0092935 and University-Institute cooperation program) and partly by the ‘‘National Agenda Project’’ program of the Korea Research Council of Fundamental Science & Technology (KRCF), funded by the Ministry of Science, ICT and Future Planning. Also, the authors would like to thank the program of the Korea Institute of Science and Technology (KIST).