DataVXAdvanced MaterialsPaper
journal article·2023-09Open access

Overcoming Charge Confinement in Perovskite Nanocrystal Solar Cells

Wenqiang Yang, Seung‐Hyeon Jo, Yipeng Tang, Jumi Park, Su Geun Ji, Seong Ho Cho, Yongseok Hong, Dong‐Hyeok Kim, Jinwoo Park, Eojin Yoon, Huanyu Zhou, Seung‐Je Woo, Hyeran Kim, Hyung Joong Yun, Yun Seog Lee, Jin Young Kim, Bin Hu, Tae‐Woo Lee

Advanced Materials· Volume 35· Issue 39
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Source abstract

Abstract

Abstract The small nanoparticle size and long‐chain ligands in colloidal metal halide perovskite quantum dots (PeQDs) cause charge confinement, which impedes exciton dissociation and carrier extraction in PeQD solar cells, so they have low short‐circuit current density Jsc, which impedes further increases in their power conversion efficiency (PCE). Here, a re‐assembling process (RP) is developed for perovskite nanocrystalline (PeNC) films made of colloidal perovskite nanocrystals to increase Jsc in PeNC solar cells. The RP of PeNC films increases their crystallite size and eliminates long‐chain ligands, and thereby overcomes the charge confinement in PeNC films. These changes facilitate exciton dissociation and increase carrier extraction in PeNC solar cells. By use of this method, the gradient‐bandgap PeNC solar cells achieve a Jsc = 19.30 mA cm−2 without compromising the photovoltage, and yield a high PCE of 16.46% with negligible hysteresis and good stability. This work provides a new strategy to process PeNC films and pave the way for high performance PeNC optoelectronic devices.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea

Research Institute of Advanced Materials Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea

Department of Materials Science and Engineering University of Tennessee 1001–1099 Estabrook Rd Knoxville TN 37996 USA

Department of Chemistry Yonsei University 50 Yonsei‐ro Seodaemoon‐gu Seoul 03722 Republic of Korea

Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea

Advanced Nano Research Group Korea Basic Science Institute (KBSI) 169‐148 Gwahak‐ro Yuseong‐gu Daejeon 34126 Republic of Korea

SN Display Co. Ltd. 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea

School of Chemical and Biological Engineering Institute of Engineering Research, Soft Foundry Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea

Funding

National Research Foundation of Korea

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