Shape control of plasmonic gold nanoparticles and its application to vacuum-free bulk hetero-junction solar cells
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Shape control of plasmonic gold nanoparticles and its application to vacuum-free bulk hetero-junction solar cells Nguyen Tam Nguyen Truong1, Chang Duk Kim2, Vasudeva Reddy Minnam Reddy1, Viet Hung Thai3, Hye Jun Jeon1, and Chinho Park1,* 1
School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea Department of Physics, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, South Korea 3 Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao Street, Ward 4, Go Vap District, Ho Chi Minh City 71408, Vietnam 2
Received: 10 August 2020
ABSTRACT
Accepted: 3 November 2020
The plasmonic gold (Au) nanoparticles (NPs) with different shapes were synthesized and characterized. The Au nanospheres (NSPs) had a size of * 7 nm, while the Au nanorods (NRs) had a size of * 7 nm of width and * 23 nm of length, which were measured from electron transmission spectroscopy (TEM) technique. The Au NPs with different shapes were incorporated into the hole transport layer (HTL) of solar cell device, which led to improving light absorption and scattering of photoactive layer, eventually leading to the increase of device performance. The surface morphology of device’s active layer was optimized by deposition of 20 nm thin ZnO buffer layer between the active layer and the electrode. Finally, the device with the structure of glass/indium tin oxide (ITO)/(polyethylene dioxy thiophene doped with polystyrene-sulfonic acid (PEDOT:PSS) ? Au NRs)/active layer/zinc oxide (ZnO)/E-GaIn showed a power conversion efficiency (PCE) of * 6%.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Polymer solar cells have been of great attraction in recent years because of their low cost, great potentials, large scale area, simple processing, and lowtemperature fabrication [1, 2]. Many research groups have studied the bulk hetero-junction (BHJ) solar
cells of donor/acceptor such as polymer and PCBM, where a large phase separated interfacial for exciton dissociation lead to improves the device performance [3, 4]. However, the thin photoactive layer restricted by the short exciton diffusion length of carriers, lowlight absorption, resulting in a low device performance in compared with inorganic solar cells. To overcome the weak light absorption of the
Nguyen Tam Nguyen Truong, Chang Duk Kim, Vasudeva Reddy Minnam Reddy have equally contributed in this work.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04822-5
J Mater Sci: Mater Electron
photoactive layer, several approaches including the using of low bandgap polymer that absorb at long wavelength of red and infrared region [5], the optimization of nanostructure to increase the optical path length in the active layer [6]. Recently, the plasmonic metals have been introduced into the BHJ organic solar cells for efficient light trapping, light absorbing by exploited plasmonic light scattering effect due to an increase in the effective optic
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