Homogeneously Blended Donor and Acceptor AgBiS2 Nanocrystal Inks Enable High‐Performance Eco‐Friendly Solar Cells with Enhanced Carrier Diffusion Length

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Advanced Energy Materials Pub Date : 2025-01-20 DOI:10.1002/aenm.202404552

Hae Jeong Kim, Jin Young Park, Ye‐Jin Choi, Soo‐Kwan Kim, Taeyeong Yong, Wonjong Lee, Gayoung Seo, Eon Ji Lee, Seongmin Choi, Hyung Ryul You, Won‐Woo Park, Soojin Yoon, Wook Hyun Kim, Jongchul Lim, Younghoon Kim, Oh‐Hoon Kwon, Jongmin Choi

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Abstract

Colloidal semiconductor nanocrystals (NCs) have garnered significant attention as promising photovoltaic materials due to their tunable optoelectronic properties enabled by surface chemistry. Among them, AgBiS2 NCs stand out as an attractive candidate for solar cell applications due to their environmentally friendly composition, high absorption coefficients, and low‐temperature processability. However, AgBiS2 NC photovoltaics generally exhibit lower power conversion efficiency (PCE) compared to other NC‐based devices, primarily due to numerous surface traps that serve as recombination sites, leading to a short diffusion length for free carriers. To address this challenge, this work develops donor and acceptor blended (D/A) AgBiS2 films. Through ligand modulation, this work formulates acceptor and donor AgBiS2 NC inks with suitable electrical band alignment for charge separation, while ensuring that they are fully miscible in the same solvent. This enabled the fabrication of high‐quality, thickness‐controllable D/A‐blended junction films. This work finds that this approach effectively facilitates carrier separation, leading to an enhanced carrier lifetime and diffusion length. As a result, using this approach, this work achieves AgBiS2 films that are twice as thick in solar cell applications compared to conventional devices, leading to improvements in current density and a solar cell PCE of 8.26%.

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均匀混合供体和受体AgBiS2纳米晶油墨使高性能生态友好型太阳能电池具有增强的载流子扩散长度

胶体半导体纳米晶体（NCs）由于其表面化学可调的光电特性而成为一种有前途的光伏材料，引起了人们的广泛关注。其中，AgBiS2纳米材料因其环保成分、高吸收系数和低温可加工性而成为太阳能电池应用的一个有吸引力的候选者。然而，与其他基于NC的器件相比，AgBiS2 NC光伏通常表现出较低的功率转换效率（PCE），这主要是由于许多表面陷阱作为重组位点，导致自由载流子的扩散长度较短。为了解决这一挑战，本研究开发了供体和受体混合（D/A） AgBiS2薄膜。通过配体调制，本研究制定了适合电荷分离的受体和供体AgBiS2 NC油墨，同时确保它们在同一溶剂中完全混溶。这使得制造高质量，厚度可控的D/A混合结膜成为可能。这项工作发现，这种方法有效地促进了载流子分离，从而提高了载流子寿命和扩散长度。因此，使用这种方法，这项工作在太阳能电池应用中实现了比传统器件厚两倍的AgBiS2薄膜，从而提高了电流密度和太阳能电池的PCE为8.26%。

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

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.