Inverted hybrid photovoltaic devices on non-planar surface for efficient charge carrier separation
Journal
japanese journal of applied physics(jjap)
Date
2014.04.28
Abstract
This paper presents the inverted organic solar cell fabricated on the cylindrical glass rod. Due to the non-conventional geometry of the substrate, a variety of deposition processes including atomic layer deposition 1), hydrothermal growth, dip coating, thermal evaporation were employed. ZnO nanorod arrays used as electron selective layer improved the device performance compared with the devices without the ZnO rods due to the vertically guided electron pathways. The thickness and morphology of active layer (P3HT:PCBM) created by dip coating process was optimized in terms of the substrate lifting speed. In addition, thermal annealing of active layer induced appropriate level of micro-phase separation of donor and acceptor, improving the charge separation, resulting in the maximum power conversion efficiency (PCE) of 1.38％. Finally, we report the solar cells on curved surface enhanced the dependency of normalized PCE on the incident angle of sunlight compared with that of planar solar cells.