Synthesis of one-dimentional nanostructures for gas sensing and photovoltaic applications

Hakan Karaagac, Elif Peksu, M. Saif Islam

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


In this work, three-dimensional (3-D) p-n junctions were formed for the fabrication of field ionization gas sensors and solar cells. P-Si micro-pillars/ZnO NWs, n-TiO2-nanorod/p-CdTe and n-Si-NW/p-CuInSe2(CIS) material combinations were preferred for the construction of p-n hetero-junction solar cells. Vertically well-aligned Si NWs were synthesized over the surface of n-type silicon wafer by using electroless etching technique. The synthesized Si-NWs embedded into a sputter deposited mono-phase chalcopyrite thin film (CIS) for the realization of nanowire array embedded in thin film type inorganic solar cell, which exhibited a 1.51% power conversion efficiency. In addition to Si nanowires, high aspect ratio vertically well-oriented p-silicon micropillars (MPs) were also synthesized using deep reactive ion Etching (DRIE) process with the BOSCH recipe of cyclical passivation and etching. Three-dimensional (3D) p-Si-MPs/n-ZnO-NWs heterostructures were constructed from hydrothermally grown dense arrays of ZnO nanowires onto these p-type silicon micropillars. The device structures were tested for both the field ionization gas sensor and photovoltaic applications, which showed very promising results. As a final part of this study, TiO2 nanorods (NRs) were grown on FTO glass substrates by using hydrothermal technique, which is sequentially coated with CdTe thin film (sputtering) and subjected to CdCl2 chemical solution treatment to fabricate a core-shell model solar cell with a power conversion efficiency over 0.4% power conversion efficiency.

Original languageEnglish
Title of host publicationLow-Dimensional Materials and Devices
EditorsNobuhiko P. Kobayashi, Albert V. Davydov, M. Saif Islam, A. Alec Talin
ISBN (Electronic)9781628417197
Publication statusPublished - 2015
EventLow-Dimensional Materials and Devices - San Diego, United States
Duration: 12 Aug 201513 Aug 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceLow-Dimensional Materials and Devices
Country/TerritoryUnited States
CitySan Diego

Bibliographical note

Publisher Copyright:
© 2015 SPIE.


  • gas sensor
  • Si micro-pillars
  • solar cell
  • ZnO nanowires


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