Semiconductor Physics, Quantum Electronics & Optoelectronics. 2005. V. 8, N 3. P. 054-059.
https://doi.org/10.15407/spqeo8.03.054


Photovoltaic and optical properties of a polymer-PbS nanocomposite
P. Lutsyk1, L. Dzura2, A. Kutsenko3, Ya. Vertsimakha1, J. Sworakowski4

1Institute of Physics, NAS of Ukraine, 46, prospect Nauky, 03028 Kyiv, Ukraine
2Taras Shevchenko Kyiv National University, Physics Department, 6, prospect Academician Glushkov, 02033 Kyiv, Ukraine
3Institute of Physical Chemistry, NAS of Ukraine, 31, prospect Nauky, 03039 Kyiv, Ukraine
4Wroclaw University of Technology, Institute of Physical and Theoretical Chemistry, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland

Abstract. Photovoltaic and optical properties of a polymer-PbS nanoparticles in polyvinyl alcohol (PVA) films and the effect of annealing in air at various temperatures on these properties are studied in this work. In the range of 1.0 to 3.7 eV, absorption spectra of PbS nanocomposite films are correctly fitted by five Gaussian bands peaking at 1.5, 1.84, 2.41, 3.06, and 3.58 eV. A characteristic feature of the films is the presence of green and blue luminescence with intensity maxima at 2.25 and 3.02 eV, respectively. The luminescence intensity strongly depends on the excitation energy and the annealing temperature in air. The highest intensity of the green luminescence is observed under the excitation with 2.35 eV radiation, whereas the intensity of the blue luminescence peaks under 3.46 eV excitation. After annealing at 370 K, the intensity of the green luminescence decreases a few times whereas the intensity of the blue emission increases. The photovoltaic sensitivity of the PbS nanocomposite films depends on the annealing conditions, attaining the maximum after annealing in air at approximately glass transition temperature of PVA (370 K). The spectral range of the photosensitivity of PbS nanocomposite films is wider than that of CdSe- and CuInS2-polymer nanocomposite films.

Keywords: PbS nanocomposite, absorption spectra, luminescence, photovoltage.

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