Graded-size Si-nanocrystal-multilayer solar cells

Dong Yeol Shin; Jae Hee Park; Sung Kim; Suk Ho Choi; Kyung Joong Kim

doi:10.1063/1.4766307

Graded-size Si-nanocrystal-multilayer solar cells

Dong Yeol Shin, Jae Hee Park, Sung Kim, Suk Ho Choi, Kyung Joong Kim

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Four kinds of Si-nanocrystal (NC) multilayers (MLs) have been fabricated on n-type Si wafers by changing the optical bandgap gradually in the directions towards the Si substrate or towards the center of the MLs through the variation of the NC size in each layer. Photovoltaic behaviors of the graded-size p-type Si-NC MLs/n-type Si-wafer heterojunction solar cells are shown to strongly depend on the ML structure. The Si-NC ML solar cells with a stepwise increase in the bandgap towards the center of the MLs exhibit best energy-conversion efficiency at low doping levels. These results are discussed based on the radiative and nonradiative processes in the graded-size Si-NC MLs, as analyzed by continuous-wave and time-resolved photoluminescence measurements.

Original language	English
Article number	104304
Journal	Journal of Applied Physics
Volume	112
Issue number	10
DOIs	https://doi.org/10.1063/1.4766307
Publication status	Published - 15 Nov 2012

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Education, Science and Technology) (MEST), (No. 2010-00771).

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10.1063/1.4766307

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title = "Graded-size Si-nanocrystal-multilayer solar cells",

abstract = "Four kinds of Si-nanocrystal (NC) multilayers (MLs) have been fabricated on n-type Si wafers by changing the optical bandgap gradually in the directions towards the Si substrate or towards the center of the MLs through the variation of the NC size in each layer. Photovoltaic behaviors of the graded-size p-type Si-NC MLs/n-type Si-wafer heterojunction solar cells are shown to strongly depend on the ML structure. The Si-NC ML solar cells with a stepwise increase in the bandgap towards the center of the MLs exhibit best energy-conversion efficiency at low doping levels. These results are discussed based on the radiative and nonradiative processes in the graded-size Si-NC MLs, as analyzed by continuous-wave and time-resolved photoluminescence measurements.",

author = "Shin, {Dong Yeol} and Park, {Jae Hee} and Sung Kim and Choi, {Suk Ho} and Kim, {Kyung Joong}",

note = "Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Education, Science and Technology) (MEST), (No. 2010-00771).",

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AU - Shin, Dong Yeol

AU - Park, Jae Hee

AU - Kim, Sung

AU - Choi, Suk Ho

AU - Kim, Kyung Joong

N1 - Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Education, Science and Technology) (MEST), (No. 2010-00771).

PY - 2012/11/15

Y1 - 2012/11/15

N2 - Four kinds of Si-nanocrystal (NC) multilayers (MLs) have been fabricated on n-type Si wafers by changing the optical bandgap gradually in the directions towards the Si substrate or towards the center of the MLs through the variation of the NC size in each layer. Photovoltaic behaviors of the graded-size p-type Si-NC MLs/n-type Si-wafer heterojunction solar cells are shown to strongly depend on the ML structure. The Si-NC ML solar cells with a stepwise increase in the bandgap towards the center of the MLs exhibit best energy-conversion efficiency at low doping levels. These results are discussed based on the radiative and nonradiative processes in the graded-size Si-NC MLs, as analyzed by continuous-wave and time-resolved photoluminescence measurements.

AB - Four kinds of Si-nanocrystal (NC) multilayers (MLs) have been fabricated on n-type Si wafers by changing the optical bandgap gradually in the directions towards the Si substrate or towards the center of the MLs through the variation of the NC size in each layer. Photovoltaic behaviors of the graded-size p-type Si-NC MLs/n-type Si-wafer heterojunction solar cells are shown to strongly depend on the ML structure. The Si-NC ML solar cells with a stepwise increase in the bandgap towards the center of the MLs exhibit best energy-conversion efficiency at low doping levels. These results are discussed based on the radiative and nonradiative processes in the graded-size Si-NC MLs, as analyzed by continuous-wave and time-resolved photoluminescence measurements.

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Graded-size Si-nanocrystal-multilayer solar cells

Abstract

Bibliographical note

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