Improvement of device performance by using zinc oxide in hybrid organic-inorganic solar cells

摘要

Zinc oxide (ZnO) nanopowder was applied to hybrid solar cells in combination with poly(3-hexylthiophene). Stability tests of the hybrid solar cell with or without encapsulation with glass and UV cut-off films were performed under 1 sun at 63 degrees C at a relative humidity of 50%. It was found that the sealed cell showed worse device performance in terms of the loss of the open-circuit voltage (V-oc), whereas the unsealed cell exposed to air retained an almost constant V-oc for more than 3 d under dark and atmospheric conditions. Placement in O-2 atmosphere in the dark led to the recovery of V-oc. Cation (Sn4+) doping into ZnO was performed, and the loss of V-oc was effectively suppressed through the restraint of the supply of the excited electron from the valence band to the conduction band. (C) 2016 The Japan Society of Applied Physics