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摘要
We propose two-dimensional periodic conical micrograting structured (MGS) polymer films as a multifunctional layer (i.e., light harvesting and self-cleaning) at the surface of outer polyethylene terephthalate (PET) cover-substrates for boosting the solar power generation in silicon (Si)-based photovoltaic (PV) modules. The surface of ultraviolet-curable NOA63 MGS polymer films fabricated by the soft imprint lithography exhibits a hydrophobic property with water contact angle of similar to 121 degrees at no inclination and dynamic advancing/receding water contact angles of similar to 132 degrees/111 degrees at the inclination angle of 40 degrees, respectively, which can remove dust particles or contaminants on the surface of PV modules in real outdoor environments (i.e., self-cleaning). The NOA63 MGS film coated on the bare PET leads to the reduction of reflection as well as the enhancement of both the total and diffuse transmissions at wavelengths of 3001100 nm, indicating lower solar weighted reflectance (R-SW) of similar to 8.2%, higher solar weighted transmittance (T-SW) of similar to 93.1%, and considerably improved average haze ratio (H-Avg) of similar to 88.3% as compared to the bare PET (i.e., R-SW approximate to 13.5%, T-SW approximate to 86.9%, and H-Avg approximate to 9.1%), respectively. Additionally, it shows a relatively good durability at temperatures of <= 160 degrees C. The resulting Si PV module with the NOA63 MGS/PET has an enhanced power conversion efficiency (PCE) of 13.26% (cf., PCE = 12.55% for the reference PV module with the bare PET) due to the mainly improved short circuit current from 49.35 to 52.01 mA, exhibiting the PCE increment percentage of similar to 5.7%. For light incident angle-dependent PV module currentvoltage characteristics, superior solar energy conversion properties are also obtained in a broad angle range of 10-80 degrees.
- 出版日期2015-2-4
