DataVXACS Energy LettersPaper
journal article·2022-08-12

Bright Lead-Free Inorganic CsSnBr3 Perovskite Light-Emitting Diodes

Jung-Min Heo, Himchan Cho, Seong-Chul Lee, Min-Ho Park, Joo Sung Kim, Hobeom Kim, Jinwoo Park, Young-Hoon Kim, Hyung Joong Yun, Eojin Yoon, Dong-Hyeok Kim, Soyeong Ahn, Sung-Joo Kwon, Chan-Yul Park, Tae-Woo Lee

ACS Energy Letters· Volume 7· Issue 8
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Source abstract

Abstract

Tin-based perovskites have emerged as lead-free alternatives, but their application in perovskite light-emitting diodes (PeLEDs) has been limited due to the low chemical stability and inhomogeneity of the inorganic CsSnBr3 films using solution processing. Here, we demonstrate bright (∼160 cd m–2) CsSnBr3 PeLEDs made by introducing co-additives consisting of SnF2 and a grain-growth inhibitor (1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene). The use of co-additives increased the number of nucleation sites during the crystallization process of CsSnBr3, and consequently yielded uniform CsSnBr3 films with decreased grain size and improved defect passivation. The crystallization-controlled CsSnBr3 PeLEDs had a maximum luminance of ∼160 cd m–2, i.e., ∼7500 times brighter than than that of the control devices (without additive, 0.02 cd m–2), and a long device lifetime of ∼30 h at 58 cd m–2. Our work suggests that control of the crystallization of CsSnBr3 during film formation is an important requirement to increase the luminescence efficiency and stability of tin-based PeLEDs.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research

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

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

Soft Foundry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea

PEROLED Inc., Building 940, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea

Institute of Engineering Research, Research Institute of Advanced Materials, 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 34133, Republic of Korea

Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 790-784, Republic of Korea

School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea

Funding

National Research Foundation of Korea · H.C. acknowledges funding from the KAIST International Joint Research Support Program.

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