Silver nanoparticles incorporated in aluminum doped ZnO for heterojunction solar cells

Juhyung Yun, Eric Kozarsky, Joondong Kim, Hossein Shokri Kojori, Sung Jin Kim, Chong Tong, Jun Wang, Wayne A. Anderson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

AZO/Si heterojunction solar cells were fabricated and investigated. In this structure AZO plays a role as a transparent current spreading layer and rectifying junction with silicon (Si). Furthermore, by introducing silver nanoparticles (Ag NPs) inside of the AZO film, light harvesting was enhanced because of plasmonic and light scattering effects ensuring minimized electrical and optical loss within the AZO. AZO was grown by co-sputtering of ZnO and Al. AZO (Al 5.78 wt%) was deposited on Si with 20, 40 nm of thickness. Ag NPs were then spread by spin coating and 230 nm of AZO was deposited again having a sandwich-like structure. In SEM observation, Ag NPs covered 4.7 % of the front surface. Solar cells were fabricated using Al front and back contacts with the size of 0.25 cm2. Computer simulations were carried out to optimize current gain regarding a total photon energy into Si. In calculation, absorption enhancement is maximized when Ag NPs are located as close to the Si layer in the range of 10 ∼ 40 nm. Experimentally, 20 nm of bottom AZO showed the best result in terms of efficiency. Spectral response showed 15 % enhancement at 430 nm and 5 ∼ 10% enhancement within 600 1 nm. Best performance was shown to have 0.36 V of Voc, 28.3 mA/cm2 of Jsc and an efficiency of 5.91 %.

Original languageEnglish (US)
Title of host publicationProgram - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012
Pages2625-2627
Number of pages3
DOIs
StatePublished - Nov 26 2012
Event38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States
Duration: Jun 3 2012Jun 8 2012

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other38th IEEE Photovoltaic Specialists Conference, PVSC 2012
CountryUnited States
CityAustin, TX
Period6/3/126/8/12

Keywords

  • Ag nanoparticles
  • Al doped ZnO
  • Heterojunction
  • Plasmonics
  • Solar cells

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

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