CdS-Decorated ZnO Nanorod Heterostructures for Improved Hybrid Photovoltaic Devices

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• 作者：Tamita Rakshit ; Suvra P. Mondal ; Indranil Manna ; Samit K. Ray
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：November 28, 2012
• 年：2012
• 卷：4
• 期：11
• 页码：6085-6095
• 全文大小：875K
• 年卷期：v.4,no.11(November 28, 2012)
• ISSN：1944-8252

文摘

Cadmium sulfide (CdS)-decorated zinc oxide (ZnO) nanorod heterostructures have been grown by a combination of hydrothermal and pulsed laser deposition techniques. Hybrid photovoltaic devices have been fabricated with CdS modified and unmodified ZnO nanorods blended separately with regioregular poly(3-hexylthiophene) (P3HT) polymer as the active layer. The solar cell performance has been studied as a function of ZnO concentration and the casting solvent (chlorobenzene, chloroform, and toluene) in the unmodified ZnO:P3HT devices. The power conversion efficiency is found to be enhanced with the increase of ZnO concentration up to a certain limit, and decreases at a very high concentration. The surface modification of ZnO nanorods with CdS leads to an increase in the open circuit voltage and short-circuit current, with enhanced efficiency by 300% over the unmodified ZnO:P3HT device, because of the cascaded band structure favoring charge transfer to the external circuit.

Keywords:

solar cells; organic-inorganic heterojunctions; ZnO nanorods; CdS-ZnO heterostructure; photoluminescence quenching