Charge-carrier relaxation in sonochemically fabricated dendronized CaSiO3–SiO2–Si nanoheterostructures

  • Rada Savkina
  • Aleksey Smirnov
  • Svitlana Kirilova
  • Volodymyr Shmid
  • Artem Podolian
  • Andriy Nadtochiy
  • Volodymyr Odarych
  • Oleg Korotchenkov
Original Article
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Abstract

We present systematic studies of charge-carrier relaxation processes in sonochemically nanostructured silicon wafers. Impedance spectroscopy and transient photovoltage techniques are employed. It is found that interface potential in Si wafers remarkably increases upon their exposure to sonochemical treatments in Ca-rich environments. In contrast, the density of fast interface electron states remains almost unchanged. It is found that the initial photovoltage decay, taken before ultrasonic treatments, exhibits the involvement of shorter- and longer time recombination and trapping centers. The decay speeds up remarkably due to cavitation treatments, which is accompanied by a substantial quenching of the photovoltage magnitude. It is also found that, before the treatments, the photovoltage magnitude is markedly non-uniform over the wafer surface, implying the existence of distributed sites affecting distribution of photoexcited carriers. The treatments cause an overall broadening of the photovoltage distribution. Furthermore, impedance measurements monitor the progress in surface structuring relevant to several relaxation processes. We believe that sonochemical nanostructuring of silicon wafers with dendronized CaSiO3 may enable new promising avenue towards low-cost solar energy efficiency multilayered solar cell device structures.

Keywords

Cavitation Silicon Nanoheterostructure Surface photovoltaic effect 
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Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.V. Lashkaryov Institute of Semiconductor PhysicsNAS of UkraineKievUkraine
  2. 2.Taras Shevchenko National University of KyivKievUkraine

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