Preparation of PbS Quantum Dots on TiO₂ Porous Film by an In-Situ Process for Solar Cells Application

Abstract

PbS QDs with size of 7–9 nm were deposited by an in-situ room temperature solution chemical reaction process using lead nitrate cationic resource in a form of solid precursor film and ammonium sulfide as an anionic reaction solution. The TiO₂ film with PbS QDs deposited by the in-situ method was used to fabricate QDs-sensitized solar cells. The power conversation efficiency of the as prepared solar cells improved by increasing cycle numbers. For 7 deposition cycles of PbS QDs, the PbS/TiO₂ device shows an open-circuit voltage (Voc) of 538 mV, a short-circuit current density (Jsc) of 0.145 mA, fill factor (FF) of 0.416 and a power conversion efficiency (η) of 0.163%.

Keywords::

• PbS
• quantum dots
• in-situ process
• sensitization
• solar cell