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Thermal assisted oxygen annealing for high efficiency planar CH?NH?PbI? perovskite solar cells.


ABSTRACT: We report investigations on the influences of post-deposition treatments on the performance of solution-processed methylammonium lead triiodide (CH?NH?PbI?)-based planar solar cells. The prepared films were stored in pure N? at room temperature or annealed in pure O? 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 O? 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 O? 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 O? 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/cm(2), and fill factor 0.64 had been achieved for our champion device.

SUBMITTER: Ren Z 

PROVIDER: S-EPMC4208060 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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

Ren Zhiwei Z   Ng Annie A   Shen Qian Q   Gokkaya Huseyin Cem HC   Wang Jingchuan J   Yang Lijun L   Yiu Wai-Kin WK   Bai Gongxun G   Djurišić Aleksandra B AB   Leung Wallace Woon-fong WW   Hao Jianhua J   Chan Wai Kin WK   Surya Charles C  

Scientific reports 20141024


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. Furthe  ...[more]

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