High-Efficiency Hybrid Polymer Solar Cells with Inorganic P- and N-Type Semiconductor Nanocrystals to Collect Photogenerated Charges

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• 作者：Shuyan Shao ; Fengmin Liu ; Zhiyuan Xie ; Lixiang Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：May 20, 2010
• 年：2010
• 卷：114
• 期：19
• 页码：9161-9166
• 全文大小：232K
• 年卷期：v.114,no.19(May 20, 2010)
• ISSN：1932-7455

文摘

Efficient charge collection is one of the most important factors to achieve high power conversion efficiency for the bulk-heterojunction solar cells based on polymer blend films. We report enhanced hybrid polymer solar cells based on blends of a semiconducting polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) as electron donor and crystalline n-type ZnO nanoparticle as electron acceptor by using p-type semiconducting Cu₂O nanocrystal as an anode buffer layer between the indium tin oxide (ITO) anode and the MEH-PPV:ZnO blend layer. The p-type Cu₂O nanocrystals of 30−40 nm diameter dispersed on ITO anode surface percolate into the MEH-PPV:ZnO blend layer serving as hole collection antenna to efficiently collect holes. The results show that the charge recombination in the MEH-PPV:ZnO blend layer resulting from low charge mobility of MEH-PPV is effectively restrained via hole-transport bypass of Cu₂O nanocrystals. Compared to the control device with poly(ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as a flat anode buffer layer, the short-circuit current increases 45% for the device with Cu₂O nanocrystal as an anode buffer layer. Moreover, the lower ionization potential of Cu₂O nanocrystal renders the device a high open-circuit voltage compared to the device with PEDOT:PSS as an anode buffer layer. The optimal device with Cu₂O nanocrystal as an anode buffer layer shows a power conversion efficiency of 2.0%, a 132% increase compared to the device with PEDOT:PSS as an anode buffer layer.