Browsing by Author "Chang, Chia-Ju"

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Blade-coated sol-gel indium-gallium-zinc-oxide for inverted polymer solar cell
(2016-11-01)
Lee, Yan-Huei
;
Tsai, Pei-Ting
;
Chang, Chia-Ju
;
Meng, Hsin-Fei
;
Horng, Sheng-Fu
The inverted organic solar cell was fabricated by using sol-gel indium-gallium-zinc-oxide (IGZO) as the electron-transport layer. The IGZO precursor solution was deposited by blade coating with simultaneous substrate heating at 120 degrees C from the bottom and hot wind from above. Uniform IGZO film of around 30 nm was formed after annealing at 400 degrees C. Using the blend of low band-gap polymer poly[(4,8-bis-(2-ethylhexyloxy)-benzo(1,2-b: 4,5-b')dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene-)-2-6-diyl)] (PBDTTT-C-T) and [6,6]-Phenyl C71 butyric acid methyl ester ([70] PCBM) as the active layer for the inverted organic solar cell, an efficiency of 6.2% was achieved with a blade speed of 180 mm/s for the IGZO. The efficiency of the inverted organic solar cells was found to depend on the coating speed of the IGZO films, which was attributed to the change in the concentration of surface OH groups. Compared to organic solar cells of conventional structure using PBDTTT-C-T: [70]PCBM as active layer, the inverted organic solar cells showed significant improvement in thermal stability. In addition, the chemical composition, as well as the work function of the IGZO film at the surface and inside can be tuned by the blade speed, which may find applications in other areas like thin-film transistors. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Large-area organic solar cells by accelerated blade coating
(2015-07-01)
Tsai, Pei-Ting
;
Yu, Kai-Chieh
;
Chang, Chia-Ju
;
Horng, Sheng-Fu
;
Meng, Hsin-Fei
Large-area photovoltaic devices have been fabricated using the blade coating technique. In this study, the use of accelerated blade motion in this technique significantly improved the thickness uniformity of blade-coated layers of polymer solar cells on an A4 glass substrate. Two types of active layers, P3HT: PC61BM and POD2T-DTBT: PC71BM, were studied. For the P3HT: PC61BM film, a thickness of 221 +/- 14 nm was realised in a 12 x 15 cm(2) active region with a coating blade acceleration of 8 mm/s(2). For the POD2T-DTBT: PC71BM film, a thickness of 98 +/- 6 nm was realised with a coating blade acceleration of 10 mm/s(2). Ten cells, each measuring 0.9 cm x 12 cm and monolithically fabricated, were connected in series, yielding a total active area of 108 cm(2). The power conversion efficiency of the resulting 10-cell module was 2.66% and 3.64% for P3HT: PC61BM and POD2T-DTBT: PC71BM, respectively. The blade coating technique involving the accelerated blade motion is therefore useful for fabricating low-cost large-area organic solar cells, and it may be a promising alternative for the commercialisation of organic solar cells. (C) 2015 Elsevier B.V. All rights reserved.