Enhanced Performance of PTB7:PC71BM Solar Cells via Different Morphologies of Gold Nanoparticles

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• 作者：Annie Ng ; Wai Kin Yiu ; Yishu Foo ; Qian Shen ; Amina Bejaoui ; Yiying Zhao ; Huseyin Cem Gokkaya ; Aleksandra B. Djuri拧i膰 ; Juan Antonio Zapien ; Wai Kin Chan ; Charles Surya
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：December 10, 2014
• 年：2014
• 卷：6
• 期：23
• 页码：20676-20684
• 全文大小：682K
• ISSN：1944-8252

文摘

The effects of gold nanoparticles (AuNPs) incorporated in the hole transporting layer (HTL) of poly[[4,8-bis[(2-ethylhexyl)oxy] benzo[1,2-b:4,5-b鈥瞉 dithiophene-2, 6-diyl] [3-fluoro-2-[(2-ethylhexy)carbonyl]thieno[3,4-b]thiophened iyl]] (PTB7): [6,6]-phenyl C₇₁ butyric acid methyl ester (PC₇₁BM) based solar cells are being systematically investigated in terms of the optical properties, electrical properties, and photovoltaic performance. The impacts of AuNPs on the optical response of the devices are modeled by finite-difference time-domain (FDTD) simulation. The size of the AuNPs used in this work is around 50鈥?0 nm, so that 10鈥?0 nm penetrated from the HTL into the active layer. We found that the power conversion efficiencies (PCEs) of the devices with AuNPs are significantly enhanced from 7.5%, for the control device, to 8.0%, 8.1%, and 8.2% for Au nanosphere-, nanorod-, and nanocube-incorporated devices, respectively. Among the photovoltaic parameters of the AuNP devices, the short circuit current density (J_SC) exhibits the largest improvement, which can be attributed to the improved optical properties of the devices. On the basis of the calculation results, the scattering cross section for the samples in the presence of AuNPs can be enhanced by a factor of 鈭?0¹⁰鈥?0¹³ and Au nanocubes exhibit superior scattering cross section compared to the Au nanospheres and nanorods with the same linear dimension. From the experimental impedance spectroscopy results, we found that the addition of AuNPs had little effect on the electrical properties of the device. The device performance is also found to be sensitive to the concentration and morphology of the AuNPs.

Keywords:

polymer solar cells; gold nanoparticles; plasmonic effect; absorption; scattering; finite-difference time-domain