Strain-Engineered PbS Quantum Dot Solar Cells with Suppressed Trap States and Enhanced Performance.

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-09-30 DOI:10.1021/acs.nanolett.5c03779

Jing Li,Xiaobo Ding,Wei Dong,Zhao Luo,Jianxun Wang,Yulu Hua,Ziqi Song,Zeyu Miao,Mengyao Liu,Jingyu Qian,Wenxu Yin,William W Yu,Zeke Liu,Xiaoyu Zhang,Weitao Zheng

引用次数: 0

Abstract

Surface strain in quantum dot (QD) films, while not a defect itself, can distort the local lattice environment and promote the formation of electronic trap states, ultimately limiting charge transport and device performance. Here, we introduce a strain-modulation strategy using guanidinium iodide (GAI) to partially disrupt the continuous PbI2-based ligand shell on PbS QDs. By relaxing the interfacial lattice strain by 53%, strain-induced trap states are suppressed, improving carrier transport in QD films. Solar cells based on these optimized films achieve a power conversion efficiency of 14.2%, compared to 12.5% in control devices. This study underscores the critical role of surface strain as a hidden regulator of electronic quality in QD solids and offers a new avenue for interfacial strain management in solution-processed optoelectronics.

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具有抑制陷阱态和增强性能的菌株工程PbS量子点太阳能电池。

量子点（QD）薄膜中的表面应变虽然本身不是缺陷，但会扭曲局部晶格环境并促进电子陷阱态的形成，最终限制电荷输运和器件性能。在这里，我们引入了一种使用碘化胍（GAI）的菌株调制策略来部分破坏PbS量子点上连续的pbi2基配体壳。通过将界面晶格应变放松53%，抑制了应变诱导的陷阱态，改善了量子点薄膜中的载流子输运。基于这些优化薄膜的太阳能电池实现了14.2%的功率转换效率，而控制设备的功率转换效率为12.5%。该研究强调了表面应变作为QD固体中电子质量的隐藏调节器的关键作用，并为溶液加工光电子学中的界面应变管理提供了新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.