Role of n-type seed-layers in microstructural evolution of intrinsic nanocrystalline silicon and solar cell performance
- Authors
- Lee, Ji Eun; Ahn, Seungkyu; Park, Joo Hyung; Yoo, Jinsu; Yoon, Kyung Hoon; Kim, Donghwan; Cho, Jun-Sik
- Issue Date
- 9월-2013
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Nanocrystalline silicon; Seed-layer; Crystallinity; Solar cell; Flexible substrate
- Citation
- CURRENT APPLIED PHYSICS, v.13, no.7, pp.1344 - 1349
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 13
- Number
- 7
- Start Page
- 1344
- End Page
- 1349
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/102392
- DOI
- 10.1016/j.cap.2013.04.006
- ISSN
- 1567-1739
- Abstract
- Nanocrystalline silicon (nc-Si:H) thin-film n-i-p solar cells were constructed on flexible stainless steel substrates by plasma-enhanced chemical vapor deposition. Influence of the n-type seed-layer on the microstructural evolution of the subsequent intrinsic nc-Si:H absorbers and the resultant performance of nc-Si:H solar cells was investigated. The crystalline volume fraction of the seed-layer can be effectively controlled by varying the hydrogen (H-2) to silane (SiH4) gas flow ratio. Defect-dense amorphous regions were observed at the initial growth stage of the i-layers deposited on low crystalline volume fraction (X-c(n)) n-type seed-layers. Increasing the X-c(n) reduced the amorphous region at the n/i interface of the i nc-Si:H layers, evidenced by Raman scattering and transmission electron microscopy (TEM) measurements. Elimination of the defect-rich amorphous region within the i-layer by depositing the nc-Si:H solar cells on highly crystalline seed-layer caused significant improvements in the short circuit current density (J(sc)) and fill factor (FF). This is mainly due to the enhancement of long-wavelength light response and extraction efficiency of photo-carrier charges. The nc-Si:H solar cells prepared on a highly crystalline seed-layer (X-c(n) = 73%) exhibited a 65.6% higher conversion efficiency than those on the n-type amorphous layers (X-c(n) = 0%). (C) 2013 Elsevier B. V. All rights reserved.
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