Wide and Tunable Bandgap MAPbBr3−xClx Hybrid Perovskites with Enhanced Phase Stability: In Situ Investigation and Photovoltaic Devices

• DOI: 10.1002/solr.202000718
• Publication Date: 2021-02-18T04:23:51Z
• Authors: Ming-Chun Tang; Hoang X. Dang; Sehyun Lee; Dounya Barrit; Rahim Munir; Kai Wang; Ruipeng Li; Detlef-M. Smilgies; Stefaan De Wolf; Dong-Yu Kim; Thomas D. Anthopo...; Aram Amassian
• Keywords: in situ UV–Vis absorbance; phase stability; wide bandgap; tunable bandgap; hybrid perovskite solar cells; time-resolved grazing incidence wide-angle X-ray scattering; 02 engineering and technology; 0210 nano-technology; 7. Clean energy

The current understanding of the crystallization, morphology evolution, and phase stability wide‐bandgap hybrid perovskite thin films is very limited, as much community's focus on lower bandgap systems. Herein, crystallization behavior film formation a wide tunable MAPbBr 3 − x Cl system are investigated, its contrasted to classical MAPbI Br case. A multiprobe in situ characterization approach consisting synchrotron‐based grazing incidence wide‐angle X‐ray scattering laboratory‐based time‐resolved UV–Vis absorbance measurements utilized show that all compositions studied (0 < 3) crystallize same way: forms directly from colloidal sol state solid cubic structure. This results significantly improved alloying these compounds compared with transformation pathway direct excludes solvated phases, contrast methylammonium lead iodide (MAPbI ). benefit antisolvent dripping overcome discontinuous layers enable device integration. Pin‐hole‐free are, thus, integrated into working single‐junction solar cell devices achieve open‐circuit voltage high 1.6 V.