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MAPbCl3 Light Absorber for Highest Voltage Perovskite Solar Cells

  • Perovskite solar cells (PSCs) excel in achieving high open-circuit voltages (VOC) for narrow bandgaps (∼1.6 eV) but face challenges with wide-bandgap perovskites, like methylammonium lead trichloride (MAPbCl3) with a 3.03 eV bandgap. These materials are transparent in visible absorbing ultraviolet (UV) light. However, achieving uniform film crystallization remains a hurdle. Here, we enhance MAPbCl3 crystallization by manipulating annealing atmospheres (nitrogen, air, and MACl vapor). Excess MACl vapor improves surface coverage, which is crucial for film stability. We demonstrate that the microstructure of the perovskite film, including surface morphology, grain boundaries, and interfaces, can affect the photovoltaic properties. The subsequently obtained VOC of 1.78 V is the highest recorded for single-junction PSCs to the best of our knowledge. Surprisingly, the conventional hole-transport layer spiro-OMeTAD, optimized for narrow bandgaps, sustains such high voltages. Photoluminescence measurements reveal a trap-assisted recombinationPerovskite solar cells (PSCs) excel in achieving high open-circuit voltages (VOC) for narrow bandgaps (∼1.6 eV) but face challenges with wide-bandgap perovskites, like methylammonium lead trichloride (MAPbCl3) with a 3.03 eV bandgap. These materials are transparent in visible absorbing ultraviolet (UV) light. However, achieving uniform film crystallization remains a hurdle. Here, we enhance MAPbCl3 crystallization by manipulating annealing atmospheres (nitrogen, air, and MACl vapor). Excess MACl vapor improves surface coverage, which is crucial for film stability. We demonstrate that the microstructure of the perovskite film, including surface morphology, grain boundaries, and interfaces, can affect the photovoltaic properties. The subsequently obtained VOC of 1.78 V is the highest recorded for single-junction PSCs to the best of our knowledge. Surprisingly, the conventional hole-transport layer spiro-OMeTAD, optimized for narrow bandgaps, sustains such high voltages. Photoluminescence measurements reveal a trap-assisted recombination peak at 1.65 eV, indicating deep traps as significant to voltage loss in MAPbCl3.show moreshow less

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Author: Waqas Zia, Mahdi Malekshahi ByranvandORCiD, Toby Rudolph, Monika RaiORCiD, Małgorzata KotORCiD, Chittaranjan DasORCiD, Mayank KediaORCiD, Mohammadreza Zohdi, Weiwei ZuoORCiD, Vishal YedduORCiD, Makhsud I. SaidaminovORCiD, Jan Ingo FlegeORCiD, Thomas KirchartzORCiD, Michael SalibaORCiD
DOI:https://doi.org/10.1021/acsenergylett.3c02777
ISSN:2380-8195
Title of the source (English):ACS Energy Letters
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2024
Tag:Perovskite solar cells; manipulation of annealing atmospheres; methylammonium lead trichloride (MAPbCl3); microstructure; trap-assisted recombination; uniform film crystallization
Volume/Year:9
First Page:1017
Last Page:1024
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Angewandte Physik und Halbleiterspektroskopie
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