A New Strategy of Methylamine Iodide Solution Assisted Repair for Pinhole-Free Perovskite Films in High-Efficiency Photovoltaics under Ambient Conditions

Liang Wang^a, Fengjing Liu^a, Xiaoyong Cai^a, Chao Jiang^a

^aNational Center for Nanoscience and Technology

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)

Benidorm, Spain, 2018 May 28th - 31st

Organizers: Emilio Palomares and Rene Janssen

Poster, Liang Wang, 094
Publication date: 21st February 2018

Perovskite solar cells (PVSCs) with high power conversion efficiency (PCE) of 22.1-22.7 % have been achieved. High quality perovskite films under ambient conditions is still a key factor.

We demonstrate a simple strategy for obtaining pinhole-free, homogeneous and well-crystallized perovskite films under ambient conditions. An additional process of methylamine iodide solution for repairing perovskite films were employed. The perovskite film with high efficiency and long carrier lifetime is verified. We achieved a high PCE of 13.07%, which is doubled compared with the value of 6.54% for the traditional PVSC. The high photoelectric parameters result from the low trap density and high recombination resistance of the resultant perovskite films are the main contributions to the high PCE. This strategy paves a new way for fabricating high quality perovskite films and PVSC devices in ambient conditions.

We also achieved good results on high stable electrolytes, low-cost counter electrodes with high catalytic activities, all natural materials for high-efficient Dye-sensitized solar cells (DSCs) and high-efficient electron transfer layers for PVSCs.

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