Room-Temperature Formation of Highly Crystalline Multication Perovskites for Efficient, Low-Cost Solar Cells

Taisuke Matsui, Ji-Youn Seo, Michael Saliba, Shaik M. Zakeeruddin, Michael Grätzel

DOI: 10.1002/adma.201606258.
First published online 20 Jan 2017
Paper on publisher's website
Paper in open access repository

A room-temperature perovskite material yielding a power conversion efficiency of 18.1% (stabilized at 17.7%) is demonstrated by judicious selection of cations. Both cesium and methylammonium are necessary for room-temperature formamidinium-based perovskite to obtain the photoactive crystalline perovskite phase and high-quality crystals. This room-temperature-made perovskite material shows great potential for low-cost, large-scale manufacturing such as roll-to-roll processing.