Solid-phase hetero epitaxial growth of α-phase formamidinium perovskite

Jin Wook Lee, Shaun Tan, Tae Hee Han, Rui Wang, Lizhi Zhang, Changwon Park, Mina Yoon, Chungseok Choi, Mingjie Xu, Michael E. Liao, Sung Joon Lee, Selbi Nuryyeva, Chenhui Zhu, Kenny Huynh, Mark S. Goorsky, Yu Huang, Xiaoqing Pan, Yang Yang

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

Conventional epitaxy of semiconductor films requires a compatible single crystalline substrate and precisely controlled growth conditions, which limit the price competitiveness and versatility of the process. We demonstrate substrate-tolerant nano-heteroepitaxy (NHE) of high-quality formamidinium-lead-tri-iodide (FAPbI3) perovskite films. The layered perovskite templates the solid-state phase conversion of FAPbI3 from its hexagonal non-perovskite phase to the cubic perovskite polymorph, where the growth kinetics are controlled by a synergistic effect between strain and entropy. The slow heteroepitaxial crystal growth enlarged the perovskite crystals by 10-fold with a reduced defect density and strong preferred orientation. This NHE is readily applicable to various substrates used for devices. The proof-of-concept solar cell and light-emitting diode devices based on the NHE-FAPbI3 showed efficiencies and stabilities superior to those of devices fabricated without NHE.

Original languageEnglish
Article number5514
JournalNature Communications
Volume11
Issue number1
DOIs
StatePublished - Dec 1 2020
Externally publishedYes

Funding

This work was supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office under award number DE-EE0008751. A portion of research was supported by the Center for Nano-phase Materials Sciences (first-principles modeling), which is a DOE Office of Science User Facility; by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) (phase diagram) funded by the Ministry of Science, ICT and Future Planning (NRF-2016M3DIA1919181). This research used resources of the Oak Ridge Leadership Computing Facility and the National Energy Research Scientific Computing Center, DOE Office of Science User Facilities. This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MIST) under contract Nos. 2020R1F1A1067223 and 2020R1C1C1008485.

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