Abstract In this study, a new configuration of dye sensitized solar cells (DSSCs), in which a TiO2 photoanode is co-sensitized by N719 organic dye and CdSe quantum dots (CdSe-QDs), was fabricated. The photovoltaic performance of the cell, which was co-sensitized with an optimum concentration of CdSe-QDs, was found to be superior to that of the cell with a photoanode sensitized using N719 dye. The superior performance can be attributed to the energy-compatible band structures of the N719 dye molecule and the CdSe-QDs, selective transfer of a significant number of photogenerated electrons from the energy state of the dye molecule to the conduction band (CB) of CdSe-QDs, and improved absorbance of the CdSe-QDs in the visible-light spectrum. This initial inflow of electrons to the dye was found to enrich the subsequent dye-mediated electron transfer to TiO2, thus contributing to the enhanced photocurrent in the DSSC. The novel material implemented in this study was based on CdSe-QDs, which were used as a co-sensitizer in the photoanode of the DSSC synthesized by pulsed laser ablation in liquid (PLAL). Morphological, structural, elemental, optical and electrochemical characterizations of the photoanodic materials were conducted; and the photovoltaic characteristics of the fabricated cell were determined. The photovoltaic conversion efficiency of the cell co-sensitized by CdSe-QDs at a certain concentration (1 mg/15 ml of ethanol) and N719 dye was found to be 7.09%, which corresponds to a 37% enhancement of the photovoltaic efficiency when compared with the cell sensitized only by the N719 dye.

中文翻译：

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基于脉冲激光合成的硒化镉量子点提高染料共敏化太阳能电池的效率

摘要 在这项研究中，制备了一种新的染料敏化太阳能电池 (DSSCs)，其中 TiO2 光阳极被 N719 有机染料和 CdSe 量子点 (CdSe-QDs) 共敏化。发现与最佳浓度的 CdSe-QD 共同敏化的电池的光伏性能优于使用 N719 染料敏化的光阳极电池的光伏性能。卓越的性能可归因于 N719 染料分子和 CdSe-QD 的能量兼容带结构，大量光生电子从染料分子的能态选择性转移到 CdSe 的导带 (CB) -QDs，以及改进的 CdSe-QDs 在可见光光谱中的吸光度。发现这种初始电子流入染料丰富了随后染料介导的电子转移到 TiO2，从而有助于增强 DSSC 中的光电流。本研究中实施的新型材料基于 CdSe-QD，其用作通过液体脉冲激光烧蚀 (PLAL) 合成的 DSSC 光阳极中的共敏剂。进行了光阳极材料的形态、结构、元素、光学和电化学表征；并确定制造的电池的光伏特性。发现由一定浓度的 CdSe-QDs（1 mg/15 ml 乙醇）和 N719 染料共敏化的电池的光伏转换效率为 7.09%，