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Proceedings Paper

Improved efficiency for nanopillar array of c-Si photovoltaic by down-conversion and anti-reflection of quantum dots
Author(s): Chien-chung Lin; Hsin-Chu Chen; Hau-Vei Han; Yu-Lin Tsai; Chia-Hua Chang; Min-An Tsai; Hao-Chung Kuo; Peichen Yu
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Paper Abstract

Improvement of efficiency for crystalline silicon (c-Si) with nanopillar arrays (NPAs) solar cell was demonstrated by deployment of CdS quantum dots (QDs). The NPAs was fabricated by colloidal lithography of self-assembled polystyrene (PS) nanospheres with a 600 nm in size and reactive-ion etching techniques, and then a colloidal CdS QDs with a concentration of 5 mg/mL was spun on the surface of c-Si with NPAs solar cell. Under a simulated one-sun condition, the device with CdS QDs shows a 33% improvement of power conversion efficiency, compared with the one without QDs. Additionally, we also found that the device with CdS QDs shows a 32% reduction in electrical resistance, compared with the one without QDs solar cell, under an ultraviolet (UV) light of 355nm illumination. This reduced electrical resistance can directly contribute to our fill-factor (FF) enhancement. For further investigation, the excitation spectrum of photoluminescence (PL), absorbance spectrum, current-voltage (I-V) characteristics, reflectance and external quantum efficiency (EQE) of the device were measured and analyzed. Based on the spectral response and optical measurement, we believe that CdS QDs not only have the capability for photon down-conversion in ultraviolet region, but also provide extra antireflection capability.

Paper Details

Date Published: 21 February 2012
PDF: 6 pages
Proc. SPIE 8256, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices, 825609 (21 February 2012); doi: 10.1117/12.908514
Show Author Affiliations
Chien-chung Lin, National Chiao Tung Univ. (Taiwan)
Hsin-Chu Chen, National Chiao Tung Univ. (Taiwan)
Hau-Vei Han, National Chiao Tung Univ. (Taiwan)
Yu-Lin Tsai, National Chiao Tung Univ. (Taiwan)
Chia-Hua Chang, National Chiao Tung Univ. (Taiwan)
Min-An Tsai, National Chiao Tung Univ. (Taiwan)
Hao-Chung Kuo, National Chiao Tung Univ. (Taiwan)
Peichen Yu, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8256:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices
Alexandre Freundlich; Jean-Francois F. Guillemoles, Editor(s)

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