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Optimizing photovoltaic performance in CuInS2 and CdS quantum dot-sensitized solar cells by using an agar-based gel polymer electrolyte

机译:琼脂基凝胶聚合物电解质优化CuInS 2 和CdS量子点敏化太阳能电池的光伏性能

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Quantum dot-sensitized solar cells (QDSSCs) offer new opportunities to address the clean energy challenge, being one of the top candidates for third generation photovoltaics. Like dye-sensitized solar cells (DSSCs), QDSSCs normally use liquid electrolytes that suffer from issues such as evaporation or leakage. In this study a gel polysulfide electrolyte was prepared containing a natural polymer, agar, and was used as a quasi-solid-state electrolyte in solar cells to replace the conventional liquid electrolytes. This gel electrolyte shows almost the same conductivity as the liquid one. The solar cells were fabricated using CuInS2 quantum dots (QDs), previously synthesized, deposited on TiO2 photoanodes by electrophoretic deposition (EPD). CdS was deposited on TiO2 by successive ionic layer adsorption and reaction (SILAR). Reduced graphene oxide (RGO)–Cu2S, brass, and thin film CuxS were used as counter electrodes. Compared to a liquid polysulfide water based electrolyte, solar cells based on CuInS2 and CdS using gel polymer electrolyte (GPE) exhibit greater incident photon to current conversion efficiency (IPCE = 51.7% at 520 nm and 72.7% at 440 nm), photocurrent density (Jsc = 10.75 and 13.51 mA cm?2), and power conversion efficiency (η = 2.97 and 2.98%) while exhibiting significantly enhanced stability. The solar cells employing the agar-based gel polymeric electrolyte are about a factor of 0.20 more stable than using a liquid electrolyte. The higher photovoltaic performance is due to the good conductivity and high wettability as well as the superior permeation capability of the gel electrolyte into the mesoporous matrix of a TiO2 film.
机译:量子点敏化太阳能电池(QDSSC)为应对清洁能源挑战提供了新的机遇,是第三代光伏技术的最佳候选人之一。像染料敏化太阳能电池(DSSC)一样,QDSSC通常使用液体电解质,这些电解质会遇到蒸发或泄漏等问题。在这项研究中,制备了含有天然聚合物琼脂的凝胶多硫化物电解质,并用作太阳能电池中的准固态电解质,以代替传统的液体电解质。该凝胶电解质显示出与液体电解质几乎相同的电导率。使用预先合成并沉积在TiO 2 光电阳极上的CuInS 2 量子点(QDs)制造太阳能电池。通过电泳沉积(EPD)。通过连续的离子层吸附和反应(SILAR),将CdS沉积在TiO 2 上。还原氧化石墨烯(RGO)–Cu 2 S,黄铜和薄膜Cu x < / small> S被用作对电极。与液态多硫化物水基电解质相比,基于CuInS 2 和使用凝胶聚合物电解质(GPE)的CdS的太阳能电池表现出更高的入射光子至电流转换效率(IPCE = 51.7)在520 nm时为%,在440 nm时为72.7%),光电流密度( J sc = 10.75和13.51 mA cm ?2 )和功率转换效率(η = 2.97和2.98%),同时表现出明显增强的稳定性。使用琼脂基凝胶聚合物电解质的太阳能电池比使用液体电解质的太阳能电池稳定约0.20倍。较高的光电性能是由于良好的导电性和高润湿性,以及凝胶电解质在TiO 2 薄膜的介孔基质中的优异渗透能力。

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