Enhanced Photovoltaic Performance of Heavy-Metal-Free AgInS2 Quantum Dot-Sensitized Solar Cells Using a Facile SILAR Method

IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Siti Utari Rahayu, Yu-Rou Wang, Ming-Way Lee
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Abstract

This study investigates the synthesis of heavy-metal-free AgInS2 quantum dots (QDs) using a facile successive ionic layer adsorption and reaction (SILAR) method, exploring their application in quantum dot-sensitized solar cells (QDSSCs). The AgInS2 QDs were grown on mesoporous TiO2 via a two-stage SILAR process at room temperature. The optimization of Ag-S SILAR cycles (n) was performed to determine the ideal conditions, while the In-S SILAR cycles were held constant at seven cycles. X-ray diffraction (XRD) pattern analysis revealed an orthorhombic crystalline structure of the synthesized AgInS2 QDs. Analysis of the optical spectra revealed a reduction in the optical energy bandgap (Eg,op) of AgInS2 QDs from 2.00 eV to 1.92 eV and further to 1.78 eV as the value of n increased from 1 to 3. Employing AgInS2 QDs, a polysulfide electrolyte, and a CuS counter electrode, liquid-junction semiconductor QDSSCs were fabricated. Optimal conditions were achieved at n = 2, resulting in outstanding power conversion efficiency (PCE) of 3.57% (Jsc = 8.56 mA/cm2, Voc = 0.64 V, FF = 65.2%). Under reduced light intensity (0.25 sun), the PCE increased to 5.26%. The external quantum efficiency (EQE) spectrum of the best cells spanned 400−700 nm, maintaining a nearly constant EQE value of ~ 65% within the 400−600 nm range. Remarkably, the PCE achieved surpassed previously reported liquid-junction AgInS2 QDSSCs. These findings highlight the facile production of heavy-metal-free AgInS2 QDs through a room-temperature SILAR method and the tunable optical properties of AgInS2 QDs by controlling Ag-S SILAR cycles, revealing their potential as an efficient solar absorber.

Graphical Abstract

Abstract Image

利用简便的 SILAR 方法提高无重金属 AgInS2 量子点敏化太阳能电池的光伏性能
本研究采用简便的连续离子层吸附和反应(SILAR)方法合成了不含重金属的 AgInS2 量子点(QDs),并探索了它们在量子点敏化太阳能电池(QDSSCs)中的应用。AgInS2 QDs 是在室温下通过两阶段 SILAR 工艺生长在介孔二氧化钛上的。对 Ag-S SILAR 周期(n)进行了优化,以确定理想的条件,而 In-S SILAR 周期则保持在七个周期不变。X 射线衍射 (XRD) 图谱分析表明,合成的 AgInS2 QDs 具有正交晶状结构。光学光谱分析显示,随着 n 值从 1 增加到 3,AgInS2 QDs 的光学能带隙(Eg,op)从 2.00 eV 减小到 1.92 eV,并进一步减小到 1.78 eV。 利用 AgInS2 QDs、多硫化物电解质和 CuS 对电极,制备出了液结半导体 QDSSC。在 n = 2 时达到最佳条件,实现了 3.57% 的出色功率转换效率 (PCE)(Jsc = 8.56 mA/cm2,Voc = 0.64 V,FF = 65.2%)。在光照强度降低(0.25 个太阳)的情况下,PCE 上升到 5.26%。最佳电池的外部量子效率(EQE)光谱横跨 400-700 纳米,在 400-600 纳米范围内,EQE 值几乎保持在 65% 左右。值得注意的是,所达到的 PCE 超过了之前报道的液态结 AgInS2 QDSSC。这些发现突显了通过室温 SILAR 方法轻松制备出不含重金属的 AgInS2 QDs,以及通过控制 Ag-S SILAR 周期实现 AgInS2 QDs 的可调光学特性,揭示了其作为高效太阳能吸收剂的潜力。
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来源期刊
Journal of Electronic Materials
Journal of Electronic Materials 工程技术-材料科学:综合
CiteScore
4.10
自引率
4.80%
发文量
693
审稿时长
3.8 months
期刊介绍: The Journal of Electronic Materials (JEM) reports monthly on the science and technology of electronic materials, while examining new applications for semiconductors, magnetic alloys, dielectrics, nanoscale materials, and photonic materials. The journal welcomes articles on methods for preparing and evaluating the chemical, physical, electronic, and optical properties of these materials. Specific areas of interest are materials for state-of-the-art transistors, nanotechnology, electronic packaging, detectors, emitters, metallization, superconductivity, and energy applications. Review papers on current topics enable individuals in the field of electronics to keep abreast of activities in areas peripheral to their own. JEM also selects papers from conferences such as the Electronic Materials Conference, the U.S. Workshop on the Physics and Chemistry of II-VI Materials, and the International Conference on Thermoelectrics. It benefits both specialists and non-specialists in the electronic materials field. A journal of The Minerals, Metals & Materials Society.
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