Improved photovoltaic performance of quantum dot-sensitized solar cells using multi-layered semiconductors with the effect of a ZnSe passivation layer
Improved photovoltaic performance of quantum dot-sensitized solar cells using multi-layered semiconductors with the effect of a ZnSe passivation layer
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DOI：
10.1039/c7nj00600d
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发表时间：
2017-06
影响因子：
3.3
通讯作者：
A. Subramanian;Dinah Punnoose;S. S. Rao-S.;Chebrolu Venkata Thulasi Varma;Bandari Naresh;Vivekanandan Raman;Hee-jee Kim
中科院分区：
文献类型：
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作者：
A. Subramanian;Dinah Punnoose;S. S. Rao-S.;Chebrolu Venkata Thulasi Varma;Bandari Naresh;Vivekanandan Raman;Hee-jee Kim
铅硫族化合物胶体量子点（QD）是在近红外光谱范围内有效应用的潜在候选者。通过简单的连续离子层吸附反应（SILAR）技术，用PbS/CdS/CdSe/ZnS和PbS/CdS/CdSe/ZnSe敏化光阳极。在本研究中，ZnSe被用作ZnS的替代品。ZnSe沉积在TiO 2/PbS/CdS/CdSe光阳极上，这在减少QDSSC中的电子复合方面更有效。使用多硫化物电解质和硫化铜对电极仔细检查QDSSC的性能。与PbS/CdS/CdSe/ZnS敏化的量子点相比，PbS/CdS/CdSe/ZnSe电极导致增强的效率。在PbS/CdS/CdSe/ZnSe体系中观察到了红移现象，这归因于量子点的联合作用。这是通过光伏研究和电化学阻抗谱证实。PbS/CdS/CdSe/ZnSe电极在1太阳光照（AM 1.5G，100 mW cm-2）下表现出17.53 mA cm-2的短路电流密度，具有4.15%的增强的功率转换效率（η）。
Lead chalcogenide colloidal quantum dots (QDs) are potential candidates for applications effective in the near infrared spectral range. Photoanodes were sensitized with PbS/CdS/CdSe/ZnS and PbS/CdS/CdSe/ZnSe via a simple successive ion layer adsorption and reaction (SILAR) technique. In the present study, ZnSe was used as an alternative to ZnS. ZnSe was deposited on a TiO2/PbS/CdS/CdSe photoanode, which was more efficient in reducing electron recombination in the QDSSCs. The performance of the QDSSCs was scrutinized using a polysulfide electrolyte and a copper sulfide counter electrode. The PbS/CdS/CdSe/ZnSe electrode resulted in enhanced efficiency as compared to the PbS/CdS/CdSe/ZnS-sensitized QDs. Red shifts with PbS/CdS/CdSe/ZnSe were observed, which were attributed to the combined effect of QDs. This was confirmed via photovoltaic studies and electrochemical impedance spectroscopy. The PbS/CdS/CdSe/ZnSe electrode exhibits a short circuit current density of 17.53 mA cm2 with an enhanced power to conversion efficiency (η) of 4.15% under 1 Sun illumination (AM 1.5G, 100 mW cm−2).