Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

doi:10.1088/1674-1056/24/4/047205

›› 2015, Vol. 24 ›› Issue (4): 47205-047205.doi: 10.1088/1674-1056/24/4/047205

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

Ali Badawi

Department of Physics, Faculty of Science, Taif University, Taif, Saudi Arabia

收稿日期:2014-09-10 修回日期:2014-11-14 出版日期:2015-04-05 发布日期:2015-04-05
基金资助:
Project supported by the Fund from Taif University, Saudi Arabia (Grant No. 1/435/3524).

Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

Ali Badawi

Department of Physics, Faculty of Science, Taif University, Taif, Saudi Arabia

Received:2014-09-10 Revised:2014-11-14 Online:2015-04-05 Published:2015-04-05
Contact: Ali Badawi E-mail:adaraghmeh@yahoo.com
Supported by:
Project supported by the Fund from Taif University, Saudi Arabia (Grant No. 1/435/3524).

摘要/Abstract

摘要： The photovoltaic performance of CdS quantum dots sensitized solar cells (QDSSCs) using the 0.2 wt% of reduced graphene oxide and TiO₂ nanoparticles (RGO+TiO₂ nanocomposite) photoanode is investigated. CdS QDs are adsorbed onto RGO+TiO₂ nanocomposite films by the successive ionic layer adsorption and reaction (SILAR) technique for several cycles. The current density-voltage (J-V) characteristic curves of the assembled QDSSCs are measured at AM1.5 simulated sunlight. The optimal photovoltaic performance for CdS QDSSC was achieved for six SILAR cycles. Solar cells based on the RGO+TiO₂ nanocomposite photoanode achieve a 33% increase in conversion efficiency (η) compared with those based on plain TiO₂ nanoparticle (NP) photoanodes. The electron back recombination rates decrease significantly for CdS QDSSCs based on RGO+TiO₂ nanocomposite photoanodes. The lifetime constant (τ) for CdS QDSSC based on the RGO+TiO₂ nanocomposite photoanode is at least one order of magnitude larger than that based on the bare TiO₂NPs photoanode.

关键词: reduced graphene oxide, nanocomposite photoanode, back recombination rate, quantum dots sensitized solar cell

Abstract: The photovoltaic performance of CdS quantum dots sensitized solar cells (QDSSCs) using the 0.2 wt% of reduced graphene oxide and TiO₂ nanoparticles (RGO+TiO₂ nanocomposite) photoanode is investigated. CdS QDs are adsorbed onto RGO+TiO₂ nanocomposite films by the successive ionic layer adsorption and reaction (SILAR) technique for several cycles. The current density-voltage (J-V) characteristic curves of the assembled QDSSCs are measured at AM1.5 simulated sunlight. The optimal photovoltaic performance for CdS QDSSC was achieved for six SILAR cycles. Solar cells based on the RGO+TiO₂ nanocomposite photoanode achieve a 33% increase in conversion efficiency (η) compared with those based on plain TiO₂ nanoparticle (NP) photoanodes. The electron back recombination rates decrease significantly for CdS QDSSCs based on RGO+TiO₂ nanocomposite photoanodes. The lifetime constant (τ) for CdS QDSSC based on the RGO+TiO₂ nanocomposite photoanode is at least one order of magnitude larger than that based on the bare TiO₂NPs photoanode.

Key words: reduced graphene oxide, nanocomposite photoanode, back recombination rate, quantum dots sensitized solar cell

中图分类号: (Electronic transport in graphene)

72.80.Vp

78.67.Wj (Optical properties of graphene) 78.67.Sc (Nanoaggregates; nanocomposites) 78.67.Hc (Quantum dots)

Ali Badawi. Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide[J]. , 2015, 24(4): 47205-047205.

Ali Badawi. Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide[J]. Chin. Phys. B, 2015, 24(4): 47205-047205.

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Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

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