TY  - JOUR
AU  - Ünlü, Feray
AU  - Kulkarni, Ashish
AU  - Lê, Khan
AU  - Bohr, Christoph
AU  - Bliesener, Andrea
AU  - Öz, Seren Dilara
AU  - Jena, Ajay Kumar
AU  - Ando, Yoichi
AU  - Miyasaka, Tsutomu
AU  - Kirchartz, Thomas
AU  - Mathur, Sanjay
TI  - Single- or double A-site cations in A3Bi2I9 bismuth perovskites: What is the suitable choice?
JO  - Journal of materials research
VL  - 36
IS  - 9
SN  - 2044-5326
CY  - Cambridge [u.a.]
PB  - Cambridge Univ. Press
M1  - FZJ-2021-03133
SP  - 1794 - 1804
PY  - 2021
AB  - Investigations on the effect of single or double A-site cation engineering on the photovoltaic performance of bismuth perovskite-inspired materials (A3Bi2I9) are rare. Herein, we report novel single- and double-cation based bismuth perovskite-inspired materials developed by (1) completely replacing CH3NH3+ (methylammonium, MA+) in MA3Bi2I9 with various organic cations such as CH(NH2)2+ (formamidinium, FA+), (CH3)2NH2+ (dimethylammonium, DMA+), C(NH2)3+ (guanidinium, GA+) and inorganic cations such as cesium (Cs+), rubidium (Rb+), potassium (K+), sodium (Na+) and lithium (Li+) and (2) partially replacing MA+ with Cs+ in different stoichiometric ratios. Compared to single-cation based bismuth perovskite devices, the double-cation bismuth perovskite device showed an increment in the device power conversion efficiency (PCE) up to 1.5% crediting to the reduction in the bandgap. This is the first study demonstrating double-cation based bismuth perovskite showing bandgap reduction and increment in device efficiency and opens up the possibilities towards compositional engineering for improved device performance.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000635073400001
DO  - DOI:10.1557/s43578-021-00155-z
UR  - https://juser.fz-juelich.de/record/894258
ER  -