期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 3, 页码 785-790出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta08668j
关键词
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资金
- New & Renewable Energy Core Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) [201330300001]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning, Republic of Korea [2014R1A5A1009799]
We synthesized a new type of PbS colloidal quantum dot (QDs) embedding CuS (PbS[CuS] QDs) by rapid injection of a sulfur precursor into a lead precursor solution followed by cation exchange of Pb with Cu ions. By the cation exchange reaction, the edge of PbS QDs was partially converted into CuS, which enhances the absorptivity of light and creates an additional absorption band in the near infrared (NIR) region due to the surface plasmon resonance (SPR) effect by the existence of vacancies in CuS. From the transient and static photoluminescence (PL) decay measurements, we found that the PL decay time of PbS[CuS] QDswas similar to 2 fold longer than that of the PbSQDs and the PbS[CuS] QDs showed great PL quenching compared to the PbS QDs. Accordingly, the generated excitons in PbS/CuS QDs are more easily dissociated into free charge carriers than those in the PbS QDs. As a result, the mesoscopic PbS/CuS QD-sensitized solar cells constructed using FTO (F-doped SnO2)/bl-TiO2 (blocking TiO2)/mesoscopic TiO2/PbS/CuS CQDs/P3HT (poly-3-hexylthiophene)/Au showed 0.6 V open-circuit voltage (V-oc), 20.7 mA cm(-2) short-circuit current density (J(sc)), 65% fill factor (FF), and 8.07% overall power conversion efficiency under 1 sun conditions (100 mWcm(-2) AM 1.5G) due to the improved absorptivity and the reduced recombination of charge carriers.
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