TY - JOUR
T1 - Methylammonium Triiodide for Defect Engineering of High-Efficiency Perovskite Solar Cells
AU - Alharbi, Essa A.
AU - Krishna, Anurag
AU - Baumeler, Thomas P.
AU - Dankl, Mathias
AU - Fish, George C.
AU - Eickemeyer, Felix
AU - Ouellette, Olivier
AU - Ahlawat, Paramvir
AU - Škorjanc, Viktor
AU - John, Elsa
AU - Yang, Bowen
AU - Pfeifer, Lukas
AU - Avalos, Claudia Esther
AU - Pan, Linfeng
AU - Mensi, Mounir
AU - Schouwink, Pascal Alexander
AU - Moser, Jacques E.
AU - Hagfeldt, Anders
AU - Rothlisberger, Ursula
AU - Zakeeruddin, Shaik M.
AU - Grätzel, Michael
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/10/8
Y1 - 2021/10/8
N2 - The defects present in metal halide perovskite are deleterious to both the performance and stability of photovoltaic devices. Consequently, there is an intense focus on developing defect mitigation strategies. Herein we report a facile strategy that employs methylammonium triiodide (MAI3) as an additive to the perovskite precursor solution. We examine the effect of MAI3 on the structural and optoelectronic properties by X-ray diffraction, density functional theory calculations, molecular dynamics simulations, solid-state nuclear magnetic resonance, steady-state, time-resolved photoluminescence (TRPL), and time-resolved terahertz spectroscopy (TRTS). Specifically, TRPL and TRTS show that MAI3 suppresses nonradiative recombination and increases the charge carrier mobility. As a result, the champion device shows a power conversion efficiency (PCE) of 23.46% with a high fill factor of >80%. Furthermore, these devices exhibit enhanced operational stability, with the best device retaining ∼90% of its initial PCE under 1 sun illumination with maximum power point tracking for 350 h.
AB - The defects present in metal halide perovskite are deleterious to both the performance and stability of photovoltaic devices. Consequently, there is an intense focus on developing defect mitigation strategies. Herein we report a facile strategy that employs methylammonium triiodide (MAI3) as an additive to the perovskite precursor solution. We examine the effect of MAI3 on the structural and optoelectronic properties by X-ray diffraction, density functional theory calculations, molecular dynamics simulations, solid-state nuclear magnetic resonance, steady-state, time-resolved photoluminescence (TRPL), and time-resolved terahertz spectroscopy (TRTS). Specifically, TRPL and TRTS show that MAI3 suppresses nonradiative recombination and increases the charge carrier mobility. As a result, the champion device shows a power conversion efficiency (PCE) of 23.46% with a high fill factor of >80%. Furthermore, these devices exhibit enhanced operational stability, with the best device retaining ∼90% of its initial PCE under 1 sun illumination with maximum power point tracking for 350 h.
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U2 - 10.1021/acsenergylett.1c01754
DO - 10.1021/acsenergylett.1c01754
M3 - Article
AN - SCOPUS:85116703030
SN - 2380-8195
VL - 6
SP - 3650
EP - 3660
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 10
ER -