Xiu-Rong Yuan, Xiao-Song Zhang, Xing-Yao Zhao, Xiao-Kai Gong, Li−Na Kong, Bao-Zeng Zhou, Jian-Ping Xu, Lan Li
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A breakthrough in the previous photoluminescence quantum (PLQY) yield of 97.2% was achieved when the content of KI was optimized to be 8%. Detailed experimental and theoretical studies have also been combined to conclude that the KI additive acts to passivate surface defects and that the broad-spectrum blue emission originates from self-trapped excitons. When combined with commercial indium tin oxide (ITO), the device may achieve broad-spectrum blue electroluminescence. Its low production cost and simple structure are its main features. Furthermore, we were able to improve the utilization of high-energy ultraviolet energy and overcome the weak absorption of short-wavelength silicon-based solar cells by using nanocrystals as down-conversion luminescent materials in conjunction with silicon-based solar cells. This increased the photoelectric conversion efficiency (PCE) for the solar cells through approximately 0.5%. The result was achieved through the principle of down-conversion. Therefore, fully inorganic metal halide Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub>: K<sup>+</sup> nanocrystals have great potential for future electroluminescence and photovoltaic applications.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Achieving High Quantum Efficiency in Cs3Cu2I5 Nanocrystals by the A-Site Ion Substitution for Flexible Blue Electroluminescence Devices and Enhanced Photovoltaic Cells\",\"authors\":\"Xiu-Rong Yuan, Xiao-Song Zhang, Xing-Yao Zhao, Xiao-Kai Gong, Li−Na Kong, Bao-Zeng Zhou, Jian-Ping Xu, Lan Li\",\"doi\":\"10.1021/acsanm.4c04442\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The outstanding photovoltaic characteristics of lead halide perovskites have made them a potential class of materials for upcoming optoelectronic applications. However, a major obstacle to the practical use of lead halide perovskites is the inherent toxicity and low environmental stability of lead. The exploration and development of nontoxic and stable alternatives for lead halide perovskites has therefore become an urgent and critical goal in the field of photovoltaics. In this paper, blue lead-free Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> nanocrystals (NCs) with bright emission were prepared by using KI as a metal additive through an improved thermal injection strategy. A breakthrough in the previous photoluminescence quantum (PLQY) yield of 97.2% was achieved when the content of KI was optimized to be 8%. Detailed experimental and theoretical studies have also been combined to conclude that the KI additive acts to passivate surface defects and that the broad-spectrum blue emission originates from self-trapped excitons. When combined with commercial indium tin oxide (ITO), the device may achieve broad-spectrum blue electroluminescence. 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引用次数: 0
摘要
卤化铅包晶石具有出色的光电特性,使其成为未来光电应用的一类潜在材料。然而,卤化铅包晶石在实际应用中的一个主要障碍是铅的固有毒性和低环境稳定性。因此,探索和开发无毒且稳定的卤化铅包晶石替代品已成为光电领域一个紧迫而关键的目标。本文通过改进的热注入策略,使用 KI 作为金属添加剂,制备了具有明亮发射的蓝色无铅 Cs3Cu2I5 纳米晶体(NCs)。当 KI 的含量优化为 8%时,光致发光量子产率(PLQY)突破性地达到了 97.2%。详细的实验和理论研究还得出结论:KI 添加剂能钝化表面缺陷,而宽光谱蓝色发射源于自俘获激子。当与商用铟锡氧化物(ITO)结合使用时,该器件可实现广谱蓝色电致发光。其主要特点是生产成本低、结构简单。此外,我们还将纳米晶体作为下转换发光材料与硅基太阳能电池结合使用,提高了高能紫外线能量的利用率,并克服了短波长硅基太阳能电池的弱吸收问题。这将太阳能电池的光电转换效率(PCE)提高了约 0.5%。这一结果是通过下转换原理实现的。因此,全无机金属卤化物 Cs3Cu2I5:K+ 纳米晶体在未来的电致发光和光伏应用中具有巨大潜力。
Achieving High Quantum Efficiency in Cs3Cu2I5 Nanocrystals by the A-Site Ion Substitution for Flexible Blue Electroluminescence Devices and Enhanced Photovoltaic Cells
The outstanding photovoltaic characteristics of lead halide perovskites have made them a potential class of materials for upcoming optoelectronic applications. However, a major obstacle to the practical use of lead halide perovskites is the inherent toxicity and low environmental stability of lead. The exploration and development of nontoxic and stable alternatives for lead halide perovskites has therefore become an urgent and critical goal in the field of photovoltaics. In this paper, blue lead-free Cs3Cu2I5 nanocrystals (NCs) with bright emission were prepared by using KI as a metal additive through an improved thermal injection strategy. A breakthrough in the previous photoluminescence quantum (PLQY) yield of 97.2% was achieved when the content of KI was optimized to be 8%. Detailed experimental and theoretical studies have also been combined to conclude that the KI additive acts to passivate surface defects and that the broad-spectrum blue emission originates from self-trapped excitons. When combined with commercial indium tin oxide (ITO), the device may achieve broad-spectrum blue electroluminescence. Its low production cost and simple structure are its main features. Furthermore, we were able to improve the utilization of high-energy ultraviolet energy and overcome the weak absorption of short-wavelength silicon-based solar cells by using nanocrystals as down-conversion luminescent materials in conjunction with silicon-based solar cells. This increased the photoelectric conversion efficiency (PCE) for the solar cells through approximately 0.5%. The result was achieved through the principle of down-conversion. Therefore, fully inorganic metal halide Cs3Cu2I5: K+ nanocrystals have great potential for future electroluminescence and photovoltaic applications.
期刊介绍:
ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.