Adjustable optical response of amorphous silicon nanowires integrated with thin films

作者：Dhindsa Navneet; Walia Jaspreet; Pathirane Minoli; Khodadad Iman; Wong William S; Saini Simarjeet Singh^*

来源：Nanotechnology, 2016, 27(14): 145703.

DOI：10.1088/0957-4484/27/14/145703

• hydrogenated amorphous silicon
• nanowires
• optical filters
• enhanced absorption
• photovoltaics

We experimentally demonstrate a new optical platform by integrating hydrogenated amorphous silicon nanowire arrays with thin films deposited on transparent substrates like glass. A 535 nm thick thin. film is anisotropically etched to fabricate vertical nanowire. arrays of 100 nm diameter arranged in a square lattice. Adjusting the nanowire length, and consequently the thin. film thickness permits the optical properties of this configuration to be tuned for either transmission filter response or enhanced broadband absorption. Vivid structural colors are also achieved in reflection and transmission. The optical properties of the platform are investigated for three different etch depths. Transmission filter response is achieved for a configuration with. nanowires on glass. without any thin film. Alternatively, integrating thin. film with nanowires increases the absorption efficiency by similar to 97% compared to the thin film starting layer and by similar to 78% over nanowires on glass. The ability to tune the optical response of this material in this fashion makes it a promising platform for high performance photovoltaics, photodetectors and sensors.

• 出版日期2016-4-8