ELECTRICAL AND PHOTOELECTRIC PROPERTIES OF ORGANIC-INORGANIC HETEROJUNCTIONS PEDOT:PSS/n-CdTe
Parkhomenko H.P. Solovan M.M. Mostovyi A.I. Orletskyi I.G. Brus V.V.
10 December 2021V N Karazin Kharkiv National University
East European Journal of Physics
2021#2021Issue 443 - 48 pp.
PEDOT: PSS thin films are widely used as transparent coatings in flexible semiconductor devices including solar cells. However, they are not widely used as transparent coatings in combination with crystal substrates. This work shows the possibility of using PEDOT:PSS thin films as a frontal transparent conducting layer in hybrid organic-inorganic Schottky type heterojunctions of the PEDOT:PSS/n-CdTe, which were prepared by deposition of PEDOT:PSS thin films (using the spin-coating method) on crystalline cadmium telluride substrates. The current-voltage (in a wide temperature range) and capacitance-voltage (at room temperature) characteristics of heterojunctions were measurement and analyzed. It has been established that PEDOT:PSS/n-CdTe heterojunctions have good diode properties with a high rectification ratio RR≈105, a potential barrier height φ0 = 0.95 eV, and series Rs = 91 Ohm and shunt Rsh = 5.7 × 107 Ohm resistances. Analysis of the forward branches of the I–V characteristics of heterojunctions showed that the dominant charge transfer mechanisms are determined by the processes of radiative recombination at low biases (3kT/e 14 cm-3. Although the photoelectric parameters of unoptimized PEDOT:PSS/n-CdTe heterojunctions are low, their photodiode characteristics (Detectivity D*> 1013 Jones) are very promising for further detailed analysis and improvement. The proposed concept of a hybrid organic-inorganic heterojunction also has potential for use in inexpensive γ-and X-ray detectors.
CdTe , current transport , heterojunction , PEDOT:PSS , photodetector
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Department of Electronics and Energy Engineering, Chernivtsi National University, Chernivtsi, 58012, Ukraine
Department of Physics, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Department of Electronics and Energy Engineering
Department of Physics
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