O3 fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH3NH3I vapor-assisted processed CH3NH3PbI3 perovskite solar cells

O₃ fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH₃NH₃I vapor-assisted processed CH₃NH₃PbI₃ perovskite solar cells

Jia En-Dong^{1, 2}, Lou Xi^{1, 3}, Zhou Chun-Lan^{1, 2, †}, Hao Wei-Chang^{3, ‡}, Wang Wen-Jing^{1, 2}

(color online) UPS corresponding to the HOMO region of the as-prepared sample and samples with different O₃ treatment times.