A simple and robust route toward flexible CIGS photovoltaic devices on polymer substrates: Atomic level microstructural analysis and local opto-electronic investigation

Kihwan Kim, Juran Kim, Myeng Gil Gang, Se Ho Kim, Soomin Song, Yunae Cho, Donghyeop Shin, Young Joo Eo, Inyoung Jeong, Seung Kyu Ahn, Ara Cho, Jayeong Kim, Seokhyun Yoon, Pyuck Pa Choi, William Jo, Jin Hyeok Kim, Jihye Gwak, Jae Ho Yun

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this work, copper indium gallium selenide (Cu(In,Ga)Se 2 ; CIGS) absorbers were grown on polyimide (PI)/molybdenum substrates by a three-stage co-evaporation process at various temperatures, film formation was systemically studied using various advanced characterization methods such as transmission electron microscopy, micro-Raman spectroscopy, Kelvin probe force microscopy, and atom probe tomography. The CIGS films on PI were found to exhibit considerable physical and electrical variations with respect to the process temperature of three-stage co-evaporation. In particular, when the process temperature reached 400 °C, the CIGS absorber on PI began to exhibit controlled microstructure and intergrain properties. By adjusting the microstructure and intergrain properties of the absorber films by means of the process temperature of three-stage co-evaporation, flexible CIGS solar cells on PI with an efficiency of 16.7% (with anti-refection coating) were achieved.

Original languageEnglish
Pages (from-to)280-290
Number of pages11
JournalSolar Energy Materials and Solar Cells
Volume195
DOIs
StatePublished - 15 Jun 2019

Keywords

  • Atom probe tomography
  • CIGS
  • Flexible
  • Polyimide
  • Solar cells

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