Improving Performance of Organic Solar Cells with PEG-coated Gold Nanorods Doped in the Active Layer

TONG Peiqian; CUI Yanxia; HAO Yuying; ZHAN Qiuqiang; SUN Qinjun; ZHU Furong

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Improving Performance of Organic Solar Cells with PEG-coated Gold Nanorods Doped in the Active Layer

TONG Peiqian 1,CUI Yanxia 2 *,HAO Yuying 1,ZHAN Qiuqiang 2,SUN Qinjun 1,ZHU Furong 3

1.Key Laboratory of Advanced Transducers and Intelligent Control System (Ministry of Education), College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024

2. Hong Kong Baptist University, 224 Waterloo Road, Kowloon Tong, Hong Kong 999077

3.Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006

*Correspondence author

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Funding: Doctoral Program of Higher Education Research Fund（No.20121402120017）, National Natural Science Foundation of China（No.11204205, 61475109, 61274056, and 61275037）, Hong Kong Scholar Program（No.XJ2013002）, China Postdoctoral Science Foundation（No.2014M550152）

Opened online: 8 October 2015

Accepted by: none

Citation: TONG Peiqian,CUI Yanxia,HAO Yuying.Improving Performance of Organic Solar Cells with PEG-coated Gold Nanorods Doped in the Active Layer[OL]. [ 8 October 2015] http://en.paper.edu.cn/en_releasepaper/content/4656369

Organic solar cells (OSCs) have many potential advantages such as easy fabrication, low cost, light weight, good flexibility, etc. However, the power conversion efficiency (PCE) of OSCs is lower than their inorganic counterparts because the thickness of the active layer is limited due to the contradiction between the electrical and optical properties. Aiming for boosting the absorption under the existing thickness of the active layer, researchers have introduced diverse light trapping elements into OSCs, e.g., metallic nanoparticles (MNPs), as they can excite localized surface plasmon resonance. Recently, there have been a series of experimental studies dedicated to understanding the influences of MNPs on the performance of OSCs. In this work, we have successfully synthesized lipophilic Au Nanorods (NRods) by surface modifying the aqueous Au NRods using NH2-PEG-SH and then dope the lipophilic Au NRods directly into the active layer of OSCs. By this way, we have improved the PCE of OSC devices from 5.9% to 6.5%, corresponding to almost 10% improvement. The significant increase in PCE comes from the increase in the short circuit current, agreeing well with the broadband enhancement in the spectra of external quantum efficiency. Besides, the film with PEG-coated Au NRods has greater optical absorption relative to the control film, reflecting that the incorporation of the MNPs helps harnessing more incident light and thus improving PCE.

Keywords:Plasmonics; Organic solar cell; Solar energy; Absorption; Light trapping

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