Parametric study of micropillar array solar cells

Heayoung P. Yoon, Yu A. Yuwen, Haoting Shen, Nikolas J. Podraza, Thomas E. Mallouk, Elizabeth C. Dickey, Joan Marie Redwing, Christopher R. Wronski, Theresa S. Mayer

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

7 Scopus citations

Abstract

Micro/nano pillar arrays are a promising architecture for high-efficiency solar cells that employ inexpensive photovoltaic materials with short minority carrier diffusion lengths (L n, p). To investigate design tradeoffs of the radial junction array solar cells, we fabricated 25 μm tall c-Si pillar array devices having different diameters and pillar filling ratios. The high-aspect-ratio radial n +-p + junctions were formed by gas phase diffusion of an n-type dopant into etched p-type Si pillars. The c-Si pillar arrays showed clear rectifying properties. The spectral reflectance decreased as the pillar filling ratio increased from 0.2 to 0.5, and no subsequent decrease was observed above a filling ratio of 0.5. Approximately two times higher cell efficiency was obtained with an 8 μm diameter (<1 L n) pillar array than with a 32 μm diameter (>3 L n) pillar array having the same pillar filling ratio.

Original languageEnglish (US)
Title of host publicationProgram - 37th IEEE Photovoltaic Specialists Conference, PVSC 2011
Pages303-306
Number of pages4
DOIs
StatePublished - Dec 1 2011
Event37th IEEE Photovoltaic Specialists Conference, PVSC 2011 - Seattle, WA, United States
Duration: Jun 19 2011Jun 24 2011

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other37th IEEE Photovoltaic Specialists Conference, PVSC 2011
CountryUnited States
CitySeattle, WA
Period6/19/116/24/11

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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