Lattice Strain Relaxation and Grain Homogenization for Efficient Inverted MAPbI3 Perovskite Solar Cells

Chengbo Li; Jie Hu; Shurong Wang; Jing Ren; Bin Chen; Taisong Pan; Xiaobin Niu; Feng Hao

doi:10.1021/acs.jpclett.1c01074

Lattice Strain Relaxation and Grain Homogenization for Efficient Inverted MAPbI₃ Perovskite Solar Cells

J Phys Chem Lett. 2021 May 20;12(19):4569-4575. doi: 10.1021/acs.jpclett.1c01074. Epub 2021 May 10.

Authors

Chengbo Li¹, Jie Hu¹, Shurong Wang¹, Jing Ren¹, Bin Chen¹, Taisong Pan¹, Xiaobin Niu¹, Feng Hao¹

Affiliation

¹ School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.

PMID: 33970641
DOI: 10.1021/acs.jpclett.1c01074

Abstract

The lattice strain of a perovskite film is vital to the controllable growth and charge transport in perovskite solar cells (PSCs). In this work, a lead chloride (PbCl₂) assisted crystallization (LCAC) protocol is introduced for releasing the strain across the interface of a NiO_x/perovskite, which induces a preferred (h00) crystal plane growth and grain homogenization. PSCs with LCAC show a facilitated charge extraction and suppressed nonradiative recombination. Thanks to the controlled film growth and strain-released interface, the inverted MAPbI₃ (MA = methylammonium) PSC devices with LCAC deliver a power conversion efficiency (PCE) over 20% with a short-circuit current density (J_sc) of 23.60 mA cm^-2, which is obviously higher than that of the control device with a PCE of 18.36% and a J_sc of 21.74 mA cm^-2. Meanwhile, the LCAC devices maintain 80% of their initial efficiency after being exposed to an ambient atmosphere with a relative humidity of 40% over 1000 h in the dark.