摘要
Cuprous sulfide （Cu2S） is a direct band-gap p-type semiconductor with excellent ionic/electronic hybrid conductivity. Alt- hough Cu/Cu2S/sulfide or polysulfide system is adopted as counter electrode of quantum-dots-sensitized solar cells （QDSSC）, the electrode process is seldom reported. Here, the electrochemical growth of Cu2S film on a copper （Cu） surface, the redox behaviors of sulfide and polysulfide, and the all-in-solid charge-transfer properties of Cu2S film are investigated. It is clarified that the copper electrode simultaneously undergoes an activated process, a membrane growth process, and a redox phase transformation process. The solid charge-transfer capability of CuzS is quantified with a high exchange-current density of 2.27 A/cm2, which elucidates that the Cu/CuzS electrode is a qualified material for counter electrodes of QDSSC. These results aid understanding of the physicochemical mechanism of QDSSC with a polysulfide electrolyte and Cu/Cu2S counter electrode.
Cuprous sulfide(Cu2S) is a direct band-gap p-type semiconductor with excellent ionic/electronic hybrid conductivity. Although Cu/Cu2S/sulfide or polysulfide system is adopted as counter electrode of quantum-dots-sensitized solar cells(QDSSC), the electrode process is seldom reported. Here, the electrochemical growth of Cu2 S film on a copper(Cu) surface, the redox behaviors of sulfide and polysulfide, and the all-in-solid charge-transfer properties of Cu2 S film are investigated. It is clarified that the copper electrode simultaneously undergoes an activated process, a membrane growth process, and a redox phase transformation process. The solid charge-transfer capability of Cu2 S is quantified with a high exchange-current density of 2.27 A/cm2, which elucidates that the Cu/Cu2 S electrode is a qualified material for counter electrodes of QDSSC. These results aid understanding of the physicochemical mechanism of QDSSC with a polysulfide electrolyte and Cu/Cu2 S counter electrode.
基金
supported by the National Basic Research Program of China(2012CB932902,2011CB933700)
the National Natural Science Foundation of China(21321062,21061120456)
the Natural Science Foundation of Fujian Province of China(2012J06004)
the Program for New Century Excellent Talents in University(NCET-12-0318)
