Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Poster Session II

HL 24.29: Poster

Tuesday, March 13, 2018, 18:30–20:30, Poster F

Quenching of the photoluminescence of CdTe QDs by PEDOT:PSS conductive polymer in water solutions and thin films — •Oleksandr Selyshchev¹, Volodymyr Dzhagan², Nikolai Gaponik³, and Dietrich R.T. Zahn¹ — ¹Semiconductor Physics, Chemnitz University of Technology, Chemnitz D-09107, Germany — ²V. Lashkaryov Institute of Semiconductor Physics, Nat. Acad. Sci. of Ukraine, 03028 Kyiv, Ukraine — ³Physical Chemistry and Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany

Quantum dots attract significant interest first of all due to their optical properties and they are considered for applications in light harvesting and emitting devices, photocatalysts, luminescent biomarkers etc. In all of these applications QDs are not "particles-in-a-box" but interact with other objects such as ligands, substrates, other QDs, which have influence on the properties of the QDs. Here we report about quenching of the PL of CdTe QDs of different sizes by the conductive polymer PEDOT:PSS in aqueous solutions and thin films. PEDOT:PSS resulted in a significant red shift (upto 0.3 eV) of the PL band of CdTe QDs. The magnitude of the shift decreased with increasing QD size. The value of the shift was proportional to the amount of PEDOT:PSS and increased with storage time of the samples. The results obtained reveal a strong and controllable interaction between the QDs and the PEDOT:PSS. The possible mechanisms underlying the observed effects are discussed based on additional information obtained by XPS, UPS, Raman and IR spectroscopies, time-resolved PL, and TEM.