Improved efficiency for nanopillar array of c-Si photovoltaic by down-conversion and anti-reflection of quantum dots

Chien-Chung Lin*, Hsin Chu Chen, Hau Vei Han, Yu Lin Tsai, Chia Hua Chang, Min An Tsai, Hao-Chung Kuo, Pei-Chen Yu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

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.

Original languageEnglish
Title of host publicationPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices
DOIs
StatePublished - 26 Apr 2012
EventPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices - San Francisco, CA, United States
Duration: 23 Jan 201226 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8256
ISSN (Print)0277-786X

Conference

ConferencePhysics, Simulation, and Photonic Engineering of Photovoltaic Devices
CountryUnited States
CitySan Francisco, CA
Period23/01/1226/01/12

Keywords

  • Antireflection
  • Down-conversion
  • Nanopillars
  • Photovoltaic
  • Quantum dots
  • Solar cell

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    Lin, C-C., Chen, H. C., Han, H. V., Tsai, Y. L., Chang, C. H., Tsai, M. A., Kuo, H-C., & Yu, P-C. (2012). Improved efficiency for nanopillar array of c-Si photovoltaic by down-conversion and anti-reflection of quantum dots. In Physics, Simulation, and Photonic Engineering of Photovoltaic Devices [825609] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8256). https://doi.org/10.1117/12.908514