• Acta Photonica Sinica
  • Vol. 49, Issue 9, 0931002 (2020)
Ren-chen LIU1, Jing LU1, He-ping CHENG2, Zhao-ming LIANG3, and Yang LIU1
Author Affiliations
  • 1Zhuhai College of Jilin University, Zhuhai, Guangdong 519041, China
  • 2School of Information Engineering, Huangshan College, Huangshan, Anhui 245041, China
  • 3Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China
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    DOI: 10.3788/gzxb20204909.0931002 Cite this Article
    Ren-chen LIU, Jing LU, He-ping CHENG, Zhao-ming LIANG, Yang LIU. Light Trapping Enhancement of Composite Rough Surface ZnO:Al Gratings in Thin Film Silicon Solar Cells[J]. Acta Photonica Sinica, 2020, 49(9): 0931002 Copy Citation Text show less

    Abstract

    This paper discussed the influence of composite rough surface aluminum-doped zinc oxide (ZnO:Al) gratings on light trapping efficiency of thin film silicon solar cells. Rough surface was characterized by correlation length (lcor) and average height (have), and superimposed on a one-dimension sine ZnO:Al grating with 980 nm period and 160 nm groove depth. The short-circuit current was higher when front electrode AZO grating had smaller lcor and larger have. As lcor=0.01, short-circuit current raised with the increase of have value, from 21.93 mA/cm2 of have=0.05 to 23.80 mA/cm2 of have=0.80. When used as back electrode, the short-circuit current decreased with the increase of have, from 25.50 mA/cm2 of have=0.05 to 24.81 mA/cm2 of have=0.80. Composite rough surface ZnO:Al grating and non-rough surface ZnO:Al grating were fabricated by chemical etching and direct current sputter respectively. Reflectivity results showed that total reflection of composite rough surface ZnO:Al grating (8.3%) was 1.9% lower than that of non-rough surface ZnO:Al grating (10.2%), and specular reflection of composite rough surface ZnO:Al grating (4.7%) was 2.1% lower than that of non-rough surface ZnO:Al grating (6.8%). Rigorous coupled wave method was used to simulate reflection of ZnO:Al grating with and non- rough surface. Results further confirmed that composite rough ZnO:Al grating was more suitable for front electrode of thin film solar cells due to its better anti-reflection effect and could obtain a larger short-circuit current. Non-rough surface ZnO:Al grating could reflect more photons back to silicon absorption layer due to its higher reflection and was more suitable for back electrode.
    Ren-chen LIU, Jing LU, He-ping CHENG, Zhao-ming LIANG, Yang LIU. Light Trapping Enhancement of Composite Rough Surface ZnO:Al Gratings in Thin Film Silicon Solar Cells[J]. Acta Photonica Sinica, 2020, 49(9): 0931002
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