title: Investigation of colloidal PbS quantum dot-based solar cells with near infrared emission.
abstract: Colloidal quantum dots (QD)-based solar cells with near infrared (NIR) emission have been investigated. Lead sulfide (PbS) QDs, which have narrow band-gap and maximize the absorption of NIR spectrum, were chosen as active materials for efficient solar cells. The inverted structure of indium tin oxide/titanium dioxide/PbS QDs/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)/silver (ITO/TiO2/PbS QDs/
  PSS/Ag) was applied for favorable electron and hole seperation from the PbS QD. Through the ligand exchange by 1,2-Ethanedithiol (EDT), the interparticle distance of the PbS QDs in thin film became closer and the performance of the PbS QD-based solar cells was improved. Our PbS QD-based inverted solar cells showed open circuit voltages (V(oc)) of 0.33 V, short circuit current density (J(sc)) of 10.89 mA/cm2, fill factor (FF) of 30%, and power conversion efficiency (PCE) of 1.11%. In our PbS QD-based multifunctional solar cell, the NIR light emission intensity was simply detected with photodiode system, which implies the potential of multi-functional diode device for various applications.
authors.forename: Sungoh
authors.initials: S
authors.lastname: Lim
authors.forename: Yohan
authors.initials: Y
authors.lastname: Kim
authors.forename: Jeongno
authors.initials: J
authors.lastname: Lee
authors.forename: Chul Jong
authors.initials: CJ
authors.lastname: Han
authors.forename: Jungwon
authors.initials: J
authors.lastname: Kang
authors.forename: Jiwan
authors.initials: J
authors.lastname: Kim