Title of Paper:Stable and efficient PbS colloidal quantum dot solar cells incorporating low-temperature processed carbon paste counter electrodes

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Date of Publication:2017-12-01

Journal:SOLAR ENERGY

Included Journals:SCIE、EI

Volume:158

Page Number:28-33

ISSN No.:0038-092X

Key Words:PbS quantum dot; Solar cell; Carbon paste; Counter electrode

Abstract:Colloidal quantum dot (CQD) solar cells with a ZnO/PbS-TBAI/PbS-EDT/carbon structure were prepared using a solution processing technique. A commercially available carbon paste that was processed at low-temperatures was used as a counter electrode in place of expensive noble metals, such as Au or Ag, which are used in traditional PbS CQD solar cells. These CQD solar cells exhibited remarkable photovoltaic performance with a short circuit density (J(sc)) of 25.6 mA/cm(2), an open circuit voltage (V-oc) of 0.45 V, a fill factor (FF) of 51.8% and a power conversion efficiency (PCE) as high as 5.9%. A reference device with an Au counter electrode had a PCE of 6.0%. The PCE of the carbon-containing CQD solar cell remained stable for 180 days when tested in ambient atmosphere, while the PCE of the Au-containing CQD solar cell lost 48.3% of its original value. Electrochemical impedance spectroscopy (EIS) demonstrated that holes within the PbS CQD were effectively transported to the carbon counter electrode. (C) 2017 Elsevier Ltd. All rights reserved.