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Maziyar Marandi

Maziyar Marandi

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0002-4882-2033
Education: PhD.
ScopusId: 55650454400
Faculty: Science
Address: Arak University
Phone:

Research

Title
Microwave activated synthesis of Ag2S and Ag2S@ZnS nanocrystals and their application in well-performing quantum dot sensitized solar cells
Type
JournalPaper
Keywords
Ag2S@ZnS quantum dots; QD sensitized solar cells; IPCE; Drop casting
Year
2020
Journal Solar Energy
DOI
Researchers Farkhondeh Sadat Mirahmadi ، Maziyar Marandi ، Masoud Karimipour ، Mehdi Molaei

Abstract

Incident photon-to-current conversion efficiency (IPCE) of CdS based quantum dot sensitized solar cells (QDSCs) is a major drawback in their low efficiency. Here we report a new trend in fabrication of QDSC with enhanced IPCE with application of as prepared Ag2S and Ag2S@ZnS QDs as a co sensitizer. Ag2S and Ag2S@ZnS QDs were synthesized first using a microwave method and were examined by means of XRD, TEM and UV–Vis spectroscopy. Then the prepared QDs were applied for the fabrication of QDSCs using a novel drop casting method. The results revealed a significant enhancement of IPCE as well as short current density (12.5 mA·cm−2) and cell efficiency (3%). The enhancement is directly related to well absorption of Ag2S with low band gap in the visible range and effective injection of photo-excited electrons to CdS compact layer according to suggested band diagram. Ag2S@ZnS co-sensitizer showed an enhancement in photocurrent density due to successful passivation of Ag2S QDs and suppressing recombination on their surface.