標題: Efficiency enhancement of InGaN/GaN multiple quantum well solar cells using CdS quantum dots and distributed Bragg reflectors
作者: Tsai, Yu-Lin
Lin, Chien-Chung
Han, Hau-Vei
Chen, Hsin-Chu
Chen, Kuo-Ju
Lai, Wei-Chi
Sheu, Jin-Kong
Lai, Fang-I
Yu, Peichen
Kuo, Hao-Chung
光電工程學系
Department of Photonics
關鍵字: InGaN multiple quantum well solar cells;quantum dots;luminescent down shifting;anti-reflection
公開日期: 2013
摘要: In recent year, InGaN-based alloy was also considered for photovoltaic devices owing to the distinctive material properties which are benefit photovoltaic performance. However, the Indium tin oxide (ITO) layer on top, which plays a role of transparent conductive oxide (TCO), can absorb UV photons without generating photocurrent. Also, the thin absorber layer in the device, which is consequent result after compromising with limited crystal quality, has caused insufficient light absorption. In this report, we propose an approach for solving these problems. A hybrid design of InGaN/GaN multiple quantum wells (MQWs) solar cells combined with colloidal CdS quantum dots (QDs) and back side distributed Bragg reflectors (DBRs) has been demonstrated. CdS QDs provide down-conversion effect at UV regime to avoid absorption of ITO. Moreover, CdS QDs also exhibit anti-reflective feature. DBRs at the back side have effectively reflected the light back into the absorber layer. CdS QDs enhance the external quantum efficiency (EQE) for light with wavelength shorter than 400 nm, while DBRs provide a broad band enhancement in EQE, especially within the region of 400 nm similar to 430 nm in wavelength. CdS QDs effectively achieved a power conversion efficiency enhancement as high as 7.2% compared to the device without assistance of CdS QDs. With the participation of DBRs, the power conversion efficiency enhancement has been further boosted to 14%. We believe that the hybrid design of InGaN/GaN MQWs solar cells with QDs and DBRs can be a method for high efficiency InGaN/GaN MQWs solar cells.
URI: http://hdl.handle.net/11536/22493
http://dx.doi.org/10.1117/12.2005823
ISBN: 978-0-8194-9389-7
ISSN: 0277-786X
DOI: 10.1117/12.2005823
期刊: PHYSICS, SIMULATION, AND PHOTONIC ENGINEERING OF PHOTOVOLTAIC DEVICES II
Volume: 8620
Appears in Collections:Conferences Paper


Files in This Item:

  1. 000322825200043.pdf