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Issue 45, 2019
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A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

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Abstract

Quadruple cation-based perovskite solar cells (PVSCs) have crossed the power conversion efficiency (PCE) of 25.2% because of their effective light harvesting ability. The perovskite materials and type of additives play a crucial role in improving the photovoltaic performance and stability. Therefore, here, we demonstrated a simple approach to reduce the grain boundaries and increase the grain size by adding thiourea (TU) as an additive in mixed halide (FAPbI3)0.85(MAPbBr3)0.15, triple cation Cs0.05[(FAPbI3)0.85(MAPbBr3)0.15]0.95 and quadruple Rb0.05{Cs0.05[(FAPbI3)0.85(MAPbBr3)0.15]0.95}0.95 cation perovskite absorbers. Our results indicate that the TU-added perovskite thin films have positive effects on the grain size, which improved up to 2.6 μm for the quadruple cation. Final optimization with the quadruple cation containing TU additive-based PVSC exhibited a 20.92% PCE, which is higher than additive-free PVSCs. Furthermore, the stability of the additive-modified PVSCs is much higher than that of bare films due to their ultra-large grain size with reduced grain boundaries. In addition, our thermal stress results exhibited that the additive-based PVSC devices display better thermal stability of more than ∼100 h at 60 °C without encapsulation.

Graphical abstract: A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

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Publication details

The article was received on 27 Aug 2019, accepted on 21 Oct 2019 and first published on 22 Oct 2019


Article type: Paper
DOI: 10.1039/C9NR07377A
Nanoscale, 2019,11, 21824-21833

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    A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

    J. V. Patil, S. S. Mali and C. K. Hong, Nanoscale, 2019, 11, 21824
    DOI: 10.1039/C9NR07377A

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