TY - JOUR
T1 - Grain Boundary Defect Passivation of Triple Cation Mixed Halide Perovskite with Hydrazine-Based Aromatic Iodide for Efficiency Improvement
AU - Rahman, Sheikh Ifatur
AU - Lamsal, Buddhi Sagar
AU - Gurung, Ashim
AU - Chowdhury, Ashraful Haider
AU - Reza, Khan Mamun
AU - Ghimire, Nabin
AU - Bahrami, Behzad
AU - Luo, Wenqin
AU - Bobba, Raja Sekhar
AU - Pokharel, Jyotshna
AU - Baniya, Abiral
AU - Laskar, Ashiqur Rahman
AU - Emshadi, Khalid
AU - Rahman, Md Tawabur
AU - Qiao, Quinn
N1 - Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/9/16
Y1 - 2020/9/16
N2 - Perovskites have been unprecedented with a relatively sharp rise in power conversion efficiency in the last decade. However, the polycrystalline nature of the perovskite film makes it susceptible to surface and grain boundary defects, which significantly impedes its potential performance. Passivation of these defects has been an effective approach to further improve the photovoltaic performance of the perovskite solar cells. Here, we report the use of a novel hydrazine-based aromatic iodide salt or phenyl hydrazinium iodide (PHI) for secondary post treatment to passivate surface and grain boundary defects in triple cation mixed halide perovskite films. In particular, the PHI post treatment reduced current at the grain boundaries, facilitated an electron barrier, and reduced trap state density, indicating suppression of leakage pathways and charge recombination, thus passivating the grain boundaries. As a result, a significant enhancement in power conversion efficiency to 20.6% was obtained for the PHI-treated perovskite device in comparison to a control device with 17.4%.
AB - Perovskites have been unprecedented with a relatively sharp rise in power conversion efficiency in the last decade. However, the polycrystalline nature of the perovskite film makes it susceptible to surface and grain boundary defects, which significantly impedes its potential performance. Passivation of these defects has been an effective approach to further improve the photovoltaic performance of the perovskite solar cells. Here, we report the use of a novel hydrazine-based aromatic iodide salt or phenyl hydrazinium iodide (PHI) for secondary post treatment to passivate surface and grain boundary defects in triple cation mixed halide perovskite films. In particular, the PHI post treatment reduced current at the grain boundaries, facilitated an electron barrier, and reduced trap state density, indicating suppression of leakage pathways and charge recombination, thus passivating the grain boundaries. As a result, a significant enhancement in power conversion efficiency to 20.6% was obtained for the PHI-treated perovskite device in comparison to a control device with 17.4%.
KW - defect passivation
KW - grain boundary passivation
KW - hybrid perovskite
KW - perovskite solar cell
KW - secondary growth
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U2 - 10.1021/acsami.0c10448
DO - 10.1021/acsami.0c10448
M3 - Article
C2 - 32829634
AN - SCOPUS:85091191319
SN - 1944-8244
VL - 12
SP - 41312
EP - 41322
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 37
ER -