The effects of pulse repetition rate on the structural, optical, and electrical properties of CIGS films grown by pulsed laser deposition

Chia Chuan Chen, Xiao-Ding Qi, Wei Che Chang, Mu Gong Tsai, In-Gann Chen, Cen Ying Lin, Ping Han Wu, Kuang Po Chang

Research output: Contribution to journalArticle

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Abstract

Well crystallized CuIn 1-x Ga x Se 2 (CIGS, x = 0.22-0.26) films were deposited at the temperatures below 300°C by pulsed laser deposition. Increasing pulse repetition rate from 5 Hz to 1 kHz significantly increased the crystallinity of films. All the films were Cu rich and those deposited with 5 Hz showed higher Ga deficiency, but in those deposited with 1 kHz the loss of Se was higher. The growth mechanisms under the low and high repetition rates as well as their effects on the grain size and composition were discussed in detail. All the films had p-type conductivity. The resistivity of 1 kHz films was two times higher but the carrier concentration was four times lower than the 5 Hz films. I-V characteristics were measured on the n-ZnO/p-CIGS heterojunctions. The junction made with 1 kHz film had a single ideality factor of 1.3 up to the high current limit, which is often seen in the high efficiency CIGS solar cells, whereas the I-V curve of the junction made with 5 Hz film consisted of two sections described by large ideality factors of 3.0 and 4.8, respectively, indicating that there are two recombination mechanisms each of which dominates at a different current region.

Original languageEnglish
Pages (from-to)772-778
Number of pages7
JournalApplied Surface Science
Volume351
DOIs
Publication statusPublished - 2015 Oct 1

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Pulse repetition rate
Pulsed laser deposition
Structural properties
Electric properties
Optical properties
Carrier concentration
Heterojunctions
Solar cells

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

Chen, Chia Chuan ; Qi, Xiao-Ding ; Chang, Wei Che ; Tsai, Mu Gong ; Chen, In-Gann ; Lin, Cen Ying ; Wu, Ping Han ; Chang, Kuang Po. / The effects of pulse repetition rate on the structural, optical, and electrical properties of CIGS films grown by pulsed laser deposition. In: Applied Surface Science. 2015 ; Vol. 351. pp. 772-778.
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The effects of pulse repetition rate on the structural, optical, and electrical properties of CIGS films grown by pulsed laser deposition. / Chen, Chia Chuan; Qi, Xiao-Ding; Chang, Wei Che; Tsai, Mu Gong; Chen, In-Gann; Lin, Cen Ying; Wu, Ping Han; Chang, Kuang Po.

In: Applied Surface Science, Vol. 351, 01.10.2015, p. 772-778.

Research output: Contribution to journalArticle

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AU - Chen, Chia Chuan

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AU - Chang, Wei Che

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AU - Chen, In-Gann

AU - Lin, Cen Ying

AU - Wu, Ping Han

AU - Chang, Kuang Po

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