2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
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    Applications of Microsphere Monolayers on Solar Cells and LEDs
    Chia-hua Chan1; Chii-chang Chen1;
    1NATIONAL CENTRAL UNIVERSITY, Taoyuan, Taiwan;
    PAPER: 278/Composite/Regular (Oral)
    SCHEDULED: 16:45/Mon./Grego (50/3rd)



    ABSTRACT:
    Thus far, solar cells are the main component for efficiently converting energy from the sun to electricity. To generate light from electric energy to the optical energy, LEDs are the main devices. The light reflection of the optical interface in these two devices is the main barrier to enhance the efficiency of the devices. In this study, we demonstrate a cost-effective method of depositing anti-reflection coatings on glass [1], GaAs [2], sapphire [3] and GaN wafers [4]. The anti-reflection layers are formed by monolayer of microspheres. The deposition is realized by dip coating method. For GaN LEDs, the microspheres can enhance the external efficiency (the output coupling of the light). The microspheres deposited on sapphire before the crystal growth can ameliorate the crystal quality of the GaN to improve the electric property of the GaN LED. The coating is also used on the glass to enhance the transmission of the light at the interface in the OLEDs. The microspheres deposited on GaAs-based solar cell can enhance the transmission of the light into the materials to improve the efficiency. We demonstrate theoretically and experimentally the concept and the devices using the monolayer of the microspheres. We have developed a novel technique to deposit the monolayer of microspheres on any flat wafers without the limit of the wafer size. We will show the monolayers of microspheres on 2-inch sapphire wafer and 4-inch silicon wafer.

    References:
    [1] Chia-Hua Chan, Alexis Fischer, Amanda Martinez-Gil, Philippe Taillepierre, Chien-Chieh Lee, Song-Lin Yang, Chia-Hung Hou, Hung-Ta Chien, Dong-Po Cai, Kuei-Chu Hsu, Chii-Chang Chen, "Anti-reflection layer formed by monolayer of microspheres," Appl. Phys. B. vol. 100, p.547, 2010.
    [2] Te-Hung Chang, Pei-Hsuan Wu, Sheng-Hui Chen, Chia-Hua Chan, Cheng-Chung Lee, Chii-Chang Chen, Yan-Kuin Su, "Efficiency Enhancement in GaAs Solar Cells Using Self-assemble Microsphere," Opt. Express. vol. 17, p. 6519, 2009.
    [3] Chia-Hung Hou , Shao-Ze Tseng , Chia-Hua Chan, Tsing-Jen Chen , Hung-Ta Chien , Fu-Li Hsiao , Hua-Kung Chiu , Chien-Chieh Lee , Yen-Ling Tsai , Chii-Chang Chen*, "Output power enhancement of light-emitting diodes via two-dimensional hole arrays generated by a monolayer of microspheres," Appl. Phys. Lett. Vol. 95, p. 133105, 2009..
    [4] Guan-Ting Chen, Jen-Inn Chyi*, Chia-Hua Chan, Chia-Hung Hou, Chii-Chang Chen, Mao-Nan Chang, "Crack-free GaN grown on AlGaN/(111)Si micropillar array fabricated by polystyrene microsphere lithography," Appl. Phys. Lett. vol. 91, p. 261910, 2007.
    [5] Chia-Hua Chan, Chia-Hung Hou, Chih-Kai Huang, Tsing-Jen Chen, Shao-Ze Tseng, Hung-Ta Chien, Cheng-Huang Kuo, Kuo-Huang Hsieh, Yen-Ling Tsai, Kuei-Chu Hsu and Chii-Chang Chen*, "Patterning periodical motif on substrates by monolayer of microspheres: Application on GaN LEDs," Jpn. J. Appl. Phys. vol. 48, p. 020212, 2009.