Multi‐Facet Passivation of Ternary Colloidal Quantum Dot Enabled by Quadruple‐Ligand Ensemble toward Efficient Lead‐Free Optoelectronics

Author:

Kim Dongeon1ORCID,Cho Gaeun12,Kim Yun Hoo1,Kwon Ji Hyun1,Oh Yeonwoo1,Yang Minjung1,Jee Seungin1,Lee In Suh1,Si Min‐Jae1,Jung Yujin3,Yang Ho Yeon1,Ahn Yongnam1,Kim Beom‐Kwan1,Kim Changjo4,Kim Han Seul56,Baek Se‐Woong1ORCID

Affiliation:

1. Department of Chemical and Biological Engineering Korea University Seoul 02841 Republic of Korea

2. Division of National Supercomputing R&D Korea Institute of Science and Technology Information (KISTI) Daejeon 34141 Republic of Korea

3. Institute for Energy Technology Korea University Seoul 02841 Republic of Korea

4. Nanotechnology and Advanced Spectroscopy Team, C‐PCS, Chemistry Division Los Alamos National Laboratory Los Alamos NM USA

5. Department of Advanced Materials Engineering Chungbuk National University Cheongju Chungbuk 28644 Republic of Korea

6. Department of Urban Energy Environmental Engineering Chungbuk National University Cheongju Chungbuk 28644 Republic of Korea

Abstract

AbstractSolution‐processed ternary‐compound semiconductor AgBiS2 colloidal quantum dots (CQDs) are promising light‐absorbing materials owing to their nontoxicity and high absorption coefficient (>106 cm−1). However, rational strategies to passivate multi‐facet of ternary‐compound CQDs and manufacture stable CQD inks have not yet been proposed. In this paper, a ligand passivation strategy is proposed using a solution‐phase ligand exchange method. A quadruple‐ligand ensemble is employed to demonstrate multifaceted passivation on AgBiS2 CQDs and a highly stable CQD ink. Density functional theory studies reveal the secondary cation adsorption of silver halide passivation, indicating the synergistic passivation of the ligand ensemble. This yields a low trap density in CQD solids, improving the power conversion efficiency to 8.1% by 53% in CQD solar cells. Furthermore, the proposed device exhibits the fastest response time of 400 ns among all reported AgBiS2 devices, demonstrating its potential for efficient lead‐free optoelectronics.

Funder

National Research Foundation of Korea

Chungbuk National University

Publisher

Wiley

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