A simple chemical route for composition graded Cu(In,Ga)S2 thin film solar cells: multi-stage paste coating

Se Jin Park; Hee Sang An; Ji Eun Kim; Hyo Sang Jeon; Sam S. Yoon; Yun Jeong Hwang; Jihyun Kim; Dong-Wook Kim; Byoung Koun Min

doi:10.1039/C5RA20751G

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A simple chemical route for composition graded Cu(In,Ga)S₂ thin film solar cells: multi-stage paste coating†

Se Jin Park,‡^ab Hee Sang An,‡^ac Ji Eun Kim,^d Hyo Sang Jeon,^a Sam S. Yoon,^c Yun Jeong Hwang,^a Jihyun Kim,^b Dong-Wook Kim*^d and Byoung Koun Min*^ac

Author affiliations

* Corresponding authors

^a Clean Energy Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Korea
E-mail: bkmin@kist.re.kr

^b Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, Korea

^c Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, Korea

^d Department of Physics, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, Korea
E-mail: dwkim@ewha.ac.kr

Abstract

In order to realize the modulation of band-gap profile in low-cost and printable CuIn_xGa_1−xS₂ thin-film solar cells, a simple chemical route, namely a multi-stage paste coating method, was developed. In particular, with this method, multiple coatings with two precursor solution pastes with different compositions were applied. Elemental analysis techniques confirmed the formation of three different graded Ga distributions (front, back, and front-and-back gradient) throughout the absorber films depending on the coating sequence with two different pastes. The back gradient cell showed the largest power conversion efficiency of 7.29%, which was almost two times larger than those of the non-graded cells.

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Article information

DOI: https://doi.org/10.1039/C5RA20751G
Article type: Paper
Submitted: 09 Oct 2015
Accepted: 25 Nov 2015
First published: 26 Nov 2015

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RSC Adv., 2015,5, 103439-103444

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A simple chemical route for composition graded Cu(In,Ga)S₂ thin film solar cells: multi-stage paste coating

S. J. Park, H. S. An, J. E. Kim, H. S. Jeon, S. S. Yoon, Y. J. Hwang, J. Kim, D. Kim and B. K. Min, RSC Adv., 2015, 5, 103439 DOI: 10.1039/C5RA20751G

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