Dual-Sensitization via Electron and Energy Harvesting in CdTe Quantum Dots Decorated ZnO Nanorod-Based Dye-Sensitized Solar Cells
Dual-Sensitization via Electron and Energy Harvesting in CdTe Quantum Dots Decorated ZnO Nanorod-Based Dye-Sensitized Solar Cells
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DOI：
10.1021/jp3046593
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发表时间：
2012-07
影响因子：
3.7
通讯作者：
Soumik Sarkar;Abhinandan Makhal;Karthik Lakshman;T. Bora;J. Dutta;S. Pal
中科院分区：
文献类型：
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作者：
Soumik Sarkar;Abhinandan Makhal;Karthik Lakshman;T. Bora;J. Dutta;S. Pal
在水溶液中制备了不同尺寸的 3-巯基丙酸 (MPA) 稳定的 CdTe 量子点 (QD)，并建立了此类 QD 在 ZnO 纳米棒 (NR) 基染料敏化太阳能电池 (DSSC) 中的潜在共敏化作用。本研究中提出的结果强调了 CdTe QD 可能对 DSSC 中的净光电流做出贡献的两条主要途径：(1) 通过光致电子转移 (PET) 将电荷载流子从 QD 直接注入 ZnO 半导体；(2) 通过福斯特共振能量转移 (FRET) 汇集收集的光来间接激发敏化染料 (SD) N719 分子。稳态和皮秒分辨发光测量相结合，分别阐明了从激发的 QD 到 ZnO NR 和 SD N719 的 PET 和 FRET 过程。基于这些优点，具有不同结构的 QD 组装 DSSC 的短路电流密度和光电导率被发现远高于采用 ...
Different-sized, 3-mercaptopropionic acid (MPA) stabilized CdTe quantum dots (QDs) have been prepared in aqueous solution, and potential cosensitization of such QDs in ZnO nanorod (NR)-based dye-sensitized solar cells (DSSCs) has been established. The results presented in this study highlight two major pathways by which CdTe QDs may contribute to the net photocurrent in a DSSC: (1) a direct injection of charge carriers from QDs to ZnO semiconductor via photoinduced electron transfer (PET) and (2) an indirect excitation of the sensitizing dye (SD) N719 molecules by funneling harvested light via Forster resonance energy transfer (FRET). The steady-state and picosecond-resolved luminescence measurements were combined to clarify the process of PET and FRET from the excited QDs to ZnO NR and SD N719, respectively. On the basis of these advantages, the short-circuit current density and the photoconductivity of the QD-assembled DSSCs with distinct architectures are found to be much higher than DSSCs fabricated w...