Tuning photocurrent response through size control of CdSe quantum dots sensitized solar cells

• Autorzy: Badawi, A. , Al-Hosiny, N. , Abdallah, S. , Talaat, H.
• Języki publikacji: EN

Abstrakty

EN

The photovoltaic characterization of CdSe quantum dots sensitized solar cells (QDSSCs) by tuning band gap of CdSe quantum dots (QDs) through size control has been investigated. Fluorine doped tin oxide (FTO) substrates were coated with 20 nm in diameter TiO2 nanoparticles (NPs). Pre-synthesized colloidal CdSe quantum dots of different sizes (from 4.0 to 5.4 nm) were deposited on the TiO2-coated substrates using direct adsorption (DA) method. The FTO counter electrodes were coated with platinum, while the electrolyte containing I(-)/I 3 (-) redox species was sandwiched between the two electrodes. The current density-voltage (J-V) characteristic curves of the assembled QDSSCs were measured for different dipping times, and AM 1.5 simulated sunlight. The maximum values of short circuit current density (Jsc) and conversion efficiency (n) are 1.62 mA/cm2 and 0.29 % respectively, corresponding to CdSe QDs of size 4.52 nm (542 nm absorption edge) and of 6 h dipping time. The variation of the CdSe QDs size mainly tunes the alignment of the conduction band minimum of CdSe with respect to that of TiO2 surface. Furthermore, the Jsc increases linearly with increasing intensity of the sun light, which indicates the sensitivity of the assembled cells.

Słowa kluczowe

EN

CdSe quantum dot; tuning band gap; direct adsorption; quantum dots sensitized solar cell; photovoltaic cells

• Czasopismo: Materials Science Poland
• Rocznik: 2013
• Tom: Vol. 31, No. 1
• Strony: 6-13
• Opis fizyczny: Bibliogr. 39 poz., rys., wykr.

Twórcy

autor

Badawi, A.

autor

Al-Hosiny, N.

autor

Abdallah, S.

autor

Talaat, H.

• Department of Physics, Faculty of Science, Taif University, Taif, Saudi Arabia

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