| 초록 |
3-D ZnO thin films were fabricated on Indium Tin Oxide (ITO) as electron-collecting layers of inverted organic solar cells. In addition, ZnO and TiO2 ultra-thin films were deposited on 3-D ZnO surfaces using atomic layer deposition. Ultrathin ZnO and/or TiO2 layers with a mean thickness of less than 5 nm could enhance photovoltaic performance of the inverted organic solar cell; in particular, short-circuit current (Jsc) and power conversion efficiency (PCE) was increased by deposition of TiO2 layers. A higher thickness of additional oxide thin film resulted in reduced photovoltaic performance. Evidence is provided that recombination of electrons and holes on the surface of ZnO can be quenched by ultra-thin layer. And also, this additional process turned out to increase stability of the IOSC significantly. |
