Methylamine-assisted growth of uniaxial-oriented perovskite thin films with millimeter-sized grains

Haochen Fan, Fengzhu Li, Pengcheng Wang, Zhenkun Gu, Jin-Hua Huang, Ke-Jian Jiang (), Bo Guan, Lian-Ming Yang, Xueqin Zhou () and YanLin Song ()
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Haochen Fan: Chinese Academy of Sciences
Fengzhu Li: Chinese Academy of Sciences
Pengcheng Wang: Chinese Academy of Sciences
Zhenkun Gu: Chinese Academy of Sciences
Jin-Hua Huang: Chinese Academy of Sciences
Ke-Jian Jiang: Chinese Academy of Sciences
Bo Guan: Chinese Academy of Sciences
Lian-Ming Yang: Chinese Academy of Sciences
Xueqin Zhou: Tianjin University
YanLin Song: Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Defects from grain interiors and boundaries of perovskite films cause significant nonradiative recombination energy loss, and thus perovskite films with controlled crystallinity and large grains is critical for improvement of both photovoltaic performance and stability for perovskite-based solar cells. Here, a methylamine (MA0) gas-assisted crystallization method is developed for fabrication of methylammonium lead iodide (MAPbI3) perovskite films. In the process, the perovskite film is formed via controlled release of MA0 gas molecules from a liquid intermediate phase MAPbI3·xMA0. The resulting perovskite film comprises millimeter-sized grains with (110)-uniaxial crystallographic orientation, exhibiting much low trap density, long carrier lifetime, and excellent environmental stability. The corresponding perovskite solar cell exhibits a power conversion efficiency (PCE) of ~ 21.36%, which is among the highest reported for MAPbI3-based devices. This method provides important progress towards the fabrication of high-quality perovskite thin films for low-cost, highly efficient and stable perovskite solar cells.

Date: 2020
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DOI: 10.1038/s41467-020-19199-6

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