Title:	Optical Properties for Solar Cell Structures by Coupling Ge Quantum Dot Multilayers with Textured Substrates
Author(s):	Y. Hoshi, T. Tayagaki, O. Aonuma, N. Usami
Keywords:	Germanium, Silicon (Si), Quantum Dots
Topic:	NEW MATERIALS AND CONCEPTS FOR SOLAR CELLS AND MODULES
Subtopic:	New Materials and Concepts for Cells
Event:	29th European Photovoltaic Solar Energy Conference and Exhibition
Session:	1BV.7.56
Pages:	313 - 315
ISBN:	3-936338-34-5
Paper DOI:	10.4229/EUPVSEC20142014-1BV.7.56
Price:	0,00 EUR
Document(s):	paper, poster

Abstract/Summary:

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We propose coupling structures of Ge quantum dot (QD) multilayers with phosphorous-doped textured substrates for realization of high performance solar cells. The coupling structures are fabricated by growth of Ge QDs after p-n junction formation to suppress thermal diffusion of Ge atoms. For the coupling structures, the protection of phosphorous-doped layers and the optimization of ion doping conditions are critical for improvement of solar cell properties. We find that external quantum efficiency in the near-infrared wavelength increases by increasing Ge coverage in the Ge QD multilayers owing to enhancement of optical absorption.