Abstract
The photovoltaic performance of alloyed CdTe0.6S0.4 quantum dot sensitized solar cells (QDSSCs) is investigated. Fluorine doped Tin Oxide (FTO) substrates were coated with 20 nm-diameter TiO2 nanoparticles (NPs). Presynthesized colloidal solution of alloyed CdTe0.6S0.4 quantum dots (QDs) of 4.2 nm was deposited onto TiO2 NPs substrates using direct adsorption (DA) technique, by dipping for different times at ambient conditions. The FTO counter electrodes were coated with platinum, while the electrolyte containing I-/I-3 redox species was sandwiched between the two electrodes. Compared to pure CdTe QDs and CdS QDs, CdTe0.6S0.4 QDs showed better photovoltaic performance. The J-V characteristic curves of the assembled QDSSCs were measured at AM 1.5 simulated sunlight. The short current density (Jsc) and efficiency (η) increase with dipping time. At 24 h dipping time, the open-circuit photovoltage Voc, Jsc, fill factor (FF), and η were 0.46 volts, 1.54 mA/cm2, 0.43% and 0.31%, respectively.
Highlights
In the last two decades, semiconductor quantum dots (QDs) or nanoparticles (NPs) have been under intensive investigations, due to their unique size-dependent optical, electrical, thermal and magnetic properties [1,2,3,4,5], especially when their size is below the corresponding exciton radius
The average particle size distribution of the synthesized CdTe0.6S0.4 QDs was measured using HRTEM (JEOL 311UHR operated at 300 KV)
Alloyed CdTe0.6S0.4 quantum dots (QDs) of 4.2 nm were adsorbed onto TiO2 nanoparticles (NPs) using the direct adsorption (DA) method, for different dipping times (0 to 24 h), as a sensitizer for solar cells
Summary
In the last two decades, semiconductor quantum dots (QDs) or nanoparticles (NPs) have been under intensive investigations, due to their unique size-dependent optical, electrical, thermal and magnetic properties [1,2,3,4,5], especially when their size is below the corresponding exciton radius. Alloyed CdTexS1−x QDs band gap can be adjusted to harvest the visible region of the solar spectrum by varying the tellurium molar ratio This makes CdTexS1−x QDs a potentially favorable material for photovoltaic solar cell applications, where QDs of the same size but with varying optical properties might be preferable. Sors [18] or the successive ionic layer adsorption and reaction deposition (SILAR) method [22] These methods provide good surface coverage, but they limit the control of QD size and yield a broad size distribution [23]. To the best of our knowledge, this is the first time that DA technique has been used to deposit such kind of QDs onto TiO2 NPs to assemble QDSSCs. Alloyed CdTe0.6S0.4 QDs sample was synthesized as the method of Talapin et al [27] by varying the amount of the second precursor.
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