title: Charge Carrier Conduction Mechanism in PbS Quantum Dot Solar Cells: Electrochemical Impedance Spectroscopy Study.
abstract: With its properties of bandgap tunability, low cost, and substrate compatibility, colloidal quantum dots (CQDs) are becoming promising materials for optoelectronic applications. Additionally, solution-processed organic, inorganic, and hybrid ligand-exchange technologies have been widely used in PbS CQDs solar cells, and currently the maximum certified power conversion efficiency of 9.9% has been reported by passivation treatment of molecular iodine. Presently, there are still some challenges, and the basic physical mechanism of charge carriers in CQDs-based solar cells is not clear. Electrochemical impedance spectroscopy is a monitoring technology for current by changing the frequency of applied alternating current voltage, and it provides an insight into its electrical properties that cannot be measured by direct current testing facilities. In this work, we used EIS to analyze the recombination resistance, carrier lifetime, capacitance, and conductivity of two typical PbS CQD solar cells Au/PbS-TBAl/ZnO/ITO and Au/PbS-EDT/PbS-TBAl/ZnO/ITO, in this way, to better understand the charge carriers conduction mechanism behind in PbS CQD solar cells, and it provides a guide to design high-performance quantum-dots solar cells.
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Haowei
authors.initials: H
authors.lastname: Wang
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Yishan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Bo
authors.initials: B
authors.lastname: He
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Weile
authors.initials: W
authors.lastname: Li
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Sulaman
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Optoelectronics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Xu
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology , Beijing 100081, P. R. China.|State Key Lab of Transducer Technology, Chinese Academy of Sciences , Beijing 100081, P. R. China.
authors.forename: Shengyi
authors.initials: S
authors.lastname: Yang
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Optoelectronics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology , Beijing 100081, P. R. China.
authors.forename: Bingsuo
authors.initials: B
authors.lastname: Zou
keywords: colloidal quantum dots (CQDs); electrochemical impedance spectroscopy (EIS); lead sulfide (PbS); recombination resistance; solar cell