Design of Nanowire Optical Cavities as Efficient Photon Absorbers

Abstract

Recent investigations of semiconductor nanowires have provided strong evidence for enhanced light absorption, which has been attributed to nanowire structures functioning as optical cavities. Precise synthetic control of nanowire parameters including chemical composition and morphology has also led to dramatic modulation of absorption properties. Here we report finite-difference time-domain (FDTD) simulations for silicon (Si) nanowire cavities to elucidate the key factors that determine enhanced light absorption. The FDTD simulations revealed that a crystalline Si nanowire with an embedded 20-nm-thick amorphous Si shell yields

Light-Emitting Devices – Luminescence from Low-Dimensional Nanostructures

“…Materials with a large surface area-tovolume ratio can be a good candidate in optoelectronics applications. Applications of devices based on optical properties can include lasers, solar cells, optical detectors and sensors, displays, photo-catalysis, imaging and phosphor devices [23][24][25][26][27][28][29][30].…”

Omnidirectional absorption enhancement of symmetry-broken crescent-deformed single-nanowire photovoltaic cells

“…Despite the antennaeffect-mediated strong absorption at short wavelengths, the overall performance of SNSCs is still far from expectation due to the narrow resonant bands and the relatively low absorption at long wavelengths. To improve the lightharvesting performance, properly engineering the structure parameters and cross-sectional morphology of the nanowires has been widely discussed in recent literatures [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. It was shown that the light absorption in nanowire devices could be effectively engineered through control over the size, geometry and orientation of the nanostructure [8].…”

NO2Sensing Properties of β-Bi2O3Nanowires Sensor Coated with Pd Nanoparticles

“…특히, 이러한 구조를 기반으로 하는 반도체 물질은, 극대화된 부피 대 표면적과 광학적 및 전 기화학적 특징으로 인하여 수많은 응용 소자로 이 용되어져 왔다 2,3) . 특히 산화물 반도체 의 경우, 각 종 화학 가스에 민감하게 반응하여 그 전기적 특성 이 변화하는데, 이러한 특징으로 인하여 각종 가스 센서의 응용이 활발히 연구되고 있다 [4][5][6] .…”