Large scale single-crystal Cu(In,Ga)Se2 nanotip arrays for high efficiency solar cell

Chin Hung Liu, Chia Hsiang Chen, Szu Ying Chen, Yu Ting Yen, Wei Chen Kuo, Yu Kuang Liao, Jenh-Yih Juang, Hao-Chung Kuo, Chih Huang Lai, Lih Juann Chen, Yu Lun Chueh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


In this paper, we demonstrated direct formation of large area Cu(In,Ga)Se2 nanotip arrays (CIGS NTRs) by using one step Ar + milling process without template. By controlling milling time and incident angles, the length of CIGS NTRs with adjustable tilting orientations can be precisely controlled. Formation criteria of these CIGS NTRs have been discussed in terms of surface curvature, multiple components, and crystal quality, resulting in a highly anisotropic milling effect. The CIGS NTRs have very low reflectance <0.1% at incident wavelengths between 300 to 1200 nm. Open circuit voltage and short circuit current of CIGS NTRs solar cell were measured to be ∼390 mV and ∼22.56 mA/cm2, yielding the filling factor and the efficiency of 59 and 5.2%, respectively. In contrast to CIGS thin film solar cell with efficiency of 3.2%, the nanostructured CIGS NTRs can have efficiency enhancement of ∼160% due to the higher light absorption ability because of the nanostructure. The merits of current approach include the latest way via template-free direct creating process of nanostructured CIGS NTRs with controllable dimensionality and large scale production without postselenization process.

Original languageEnglish
Pages (from-to)4443-4448
Number of pages6
JournalNano Letters
Issue number10
StatePublished - 12 Oct 2011


  • Cu(In,Ga)Se2 nanotip arrays
  • milling process
  • postseleneizatoin
  • solar cell

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