Study on photonic-crystal effects on photovoltaic materials towards efficient photovoltaic devices

光伏材料的光子晶体效应研究以实现高效光伏器件

• 批准号: 23686050
• 负责人: FUJITA Masayuki
• 金额: $ 17.14万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (A)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23686050/
• 关键词: フォトニック結晶; 光電変換材料; 光電変換素子; 光吸収; 太陽電池; 光捕獲; 光閉じ込め; フォトニック結晶; 光電変換材料; 光電変換素子; 光吸収; 太陽電池; 光捕獲; 光閉じ込め

We demonstrate an enhancement of the optical absorption and photoelectric-conversion efficiency of an ultrathin (50 nm) silicon active-layer photodetecting device using a two-dimensional photonic crystal. We show both experimentally and with simulations that the incident-light absorption within the active layer is enhanced by optical-resonance effects at the photonic band edge. We also find that a photonic crystal with deeper holes can lead to an even larger absorption enhancement due to better Q-factor matching between the photonic band-edge modes and the intrinsic material absorption. The experimentally observed photocurrent of the fabricated photonic crystal sample is increased by a factor of around 20 at the photonic band-edge wavelength relative to that of a control sample without the photonic crystal which is attributed to the improved Q matching. We also investigate broadband optical absorption enhancement in thin silicon photovoltaic devices by photonic crystal.

我们证明了使用二维光子晶体的超薄（50 nm）硅Active-Layer光电检测装置的光学吸收和光电传感效率提高。我们在实验和模拟的情况下表明，通过光子带边缘的光谐效应增强了活性层中的入射光吸收。我们还发现，具有更深孔的光子晶体会导致更大的吸收增强，因为光子带缘模式和固有材料吸收之间的Q-因子匹配更好。相对于没有光子晶体的对照样品，在光子带边缘波长下，在光子带边缘波长下，实验观察到的光电流增加了约20倍，这归因于改进的Q匹配。我们还通过光子晶体研究了薄硅光伏设备中宽带光吸收的增强。