| The low conversion caused by the light reflection in solar devices has become one of the bottlenecks of the development of new energy. Therefore, antireflective coatings (ARCs) are introduced to eliminate reflection loss.Criteria for ARCs was derived through solving Maxwell equation. Then, based on the design criteria, a double layer coating was obtained from methyltrimethoxysilane (MTMS) and tetraethoxysilane (TEOS) through sol-gel method. The resultant coating revealed antireflective performance in broadband form400to900nm with maximum transmittance of99.2%, which was in well agreement with the calculated results. Thirdly, the temperature effect on transparency and wettability of MTMS/TEOS based coatings was systematically studied. When temperature went up from100to300℃, the transmittance of MTMS/TEOS based films increased while that of TEOS film decreased. Moreover, TEOS film became more hydrophilic at high temperarue due to the intramolecular hydrogen bonded hydroxyl. This hydrogen bonding effect was weakened as MTMS was indrocuded into film matrix. Last, catalyst-free sol-gel method was performed to fabricate antireflective coatings from y-aminopropyltriethoxysilane (APTES) and MTMS. The optical transmission of resultant films increased first and then decreased as MTMS/APTES molar ratio and aging time increase. Film with MTMS/APTES of3:1and aging time of3h revealed the higest transmittance of95.7%. |
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