Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
We demonstrate degradation mechanism of CH3NH3PbI3 PSCs and their recovering effects by introducing CH3NH3I layers. After degradation by exposing to air under 1 sun condition for 18 hour, the CH3NH3PbI3 perovskite absorption between 530 nm and 800 nm decreases, and thereby the energy band gap increases. The X-ray diffraction (XRD) patterns indicate that the moisture with sunlight corrodes CH3NH3PbI3 perovskite into PbI2, which generates the crack-like voids on the surface of the illumination-degraded CH3NH3PbI3 perovskite thin films. As a result, the PSC photovoltaic performance is degraded and the power conversion efficiency (PCE) is reduced from 16.8 to 0.7%. However, the PCE is recovered to 7.6% by introducing CH3NH3I layer to the illumination-degraded CH3NH3PbI3 perovskite thin films. Recovering of the CH3NH3PbI3 perovskite absorption between 530 nm and 800 nm and the CH3NH3PbI3-perovskite-assigned peaks in the XRD patterns verifies that the illumination-degraded PbI2 is recombined with spin coated CH3NH3I, and the CH3NH3PbI3 perovskite structure is recrystallized [1].
[1] Quang-Duy Dao, Ryotaro Tsuji, Akihiko Fujii, and Masanori Ozaki, submitted to Organic Electronics.
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