Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu2-xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jun Xu
  • Qingdan Yang
  • Wenpei Kang
  • Xing Huang
  • Chunyan Wu
  • Li Wang
  • Linbao Luo

Detail(s)

Original languageEnglish
Pages (from-to)840-847
Journal / PublicationParticle and Particle Systems Characterization
Volume32
Issue number8
Publication statusPublished - 1 Aug 2015

Abstract

In this work, a facile and low-temperature water evaporation approach to prepare columnar superstructures consisting of face centered cubic (fcc) Cu2-xSe nanoflakes stacked along 〈111〉 direction is reported. Formation of such unique stacked nanoflake assemblies is resulted from oriented attachment of isolated hexagonal CuSe nanoflakes along the 〈001〉 direction with a ripening effect driven by solvent evaporation, and then followed by a phase conversion into fcc Cu2-xSe. Evolution from hexagonal CuSe nanoflakes to fcc Cu2-xSe columnar superstructures results in obvious red-shift of band-gap absorption edge from 670 to 786 nm and dramatically decreased Raman resonance band intensity of the Se-Se stretching mode at 259 cm-1 due to the phase conversion and composition variation. Remarkably, the Cu2-xSe columnar superstructures are employed as low-cost and highly efficient counter electrodes (CEs) in quantum dot sensitized solar cells, exhibiting excellent electrocatalytic activity for polysulfide electrolyte regeneration. A ZnSe/CdSe cosensitized solar cell using the Cu2-xSe CE shows a significant increase in fill factor and short-current density (JSC) and yields a 128% enhancement in power conversion efficiency as compared to the traditional noble metal Pt CE.

Research Area(s)

  • copper selenides, oriented growth, phase conversion, solar cells, water evaporation

Citation Format(s)

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu2-xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications. / Xu, Jun; Yang, Qingdan; Kang, Wenpei; Huang, Xing; Wu, Chunyan; Wang, Li; Luo, Linbao; Zhang, Wenjun; Lee, Chun-Sing.

In: Particle and Particle Systems Characterization, Vol. 32, No. 8, 01.08.2015, p. 840-847.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review