Thermal assisted oxygen annealing for high efficiency planar CH3NH3PbI3 perovskite solar cells

Zhiwei Ren, Annie Ng, Qian Shen, Huseyin Cem Gokkaya, Jingchuan Wang, Lijun Yang, Wai Kin Yiu, Gongxun Bai, Aleksandra B. Djurišić, Wallace Woon Fong Leung, Jianhua Hao, Wai Kin Chan, Charles Surya

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89 Citations (Scopus)


We report investigations on the influences of post-deposition treatments on the performance of solution-processed methylammonium lead triiodide (CH3NH3PbI3)-based planar solar cells. The prepared films were stored in pure N2 at room temperature or annealed in pure O2 at room temperature, 45°C, 65°C and 85°C for 12 hours prior to the deposition of the metal electrodes. It is found that annealing in O2 leads to substantial increase in the power conversion efficiencies (PCEs) of the devices. Furthermore, strong dependence on the annealing temperature for the PCEs of the devices suggests that a thermally activated process may underlie the observed phenomenon. It is believed that the annealing process may facilitate the diffusion of O2 into the spiro-MeOTAD for inducing p-doping of the hole transport material. Furthermore, the process can result in lowering the localized state density at the grain boundaries as well as the bulk of perovskite. Utilizing thermal assisted O2 annealing, high efficiency devices with good reproducibility were attained. A PCE of 15.4% with an open circuit voltage (VOC) 1.04 V, short circuit current density (JSC) 23 mA/cm2, and fill factor 0.64 had been achieved for our champion device.

Original languageEnglish
Article number6752
JournalScientific Reports
Publication statusPublished - Oct 24 2014
Externally publishedYes

ASJC Scopus subject areas

  • General

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