Characterization and Photovoltaic Propertiesof Cr-doped ZnS Quantum Dots

Abstract

The structural, optical, magnetic and photovoltaic properties of pure and Cr doped ZnS quantum

dots (QD) were investigated at room temperature. It was confirmed by X-ray diffraction analysis that there are

no mixed phases in the pure and Cr doped ZnS QDs and that the QDs have a cubic structure. It was observed

that the wavelengths of the Cr-doped QDs show a blue shift compared to pure ZnS QDs with the UV-visible

absorption spectrum. In other words, the bandgap of ZnS QDs indicated an increase when it was doped with Cr.

With magnetic hysteresis measurements, Cr-doped ZnS QDs were shown to exhibit superparamagnetic behavior

at room temperature. In addition, the photovoltaic properties of pure and Cr doped ZnS QDs were investigated by

incident photon-to-current efficiency (IPCE) measurements. The results show that Cr-doped ZnS QDs can be used

as sensitizers to improve the performance of solar cells.

Keywords

• Characterization,Cr-doped ZnS,photovoltaic,quantum dots

Cr Katkılı ZnS Kuantum Noktalarının Karakterizasyonu ve Fotovoltaik Özelliklerinin İncelenmesi

Abstract

Saf ve Cr katkılı ZnS kuantum nokta (QD) ‘larının yapısal, optiksel, manyetiksel ve fotovoltaik özellikleri

oda sıcaklığında incelendi. Saf ve Cr katkılı ZnS QD’ler içerisinde herhangi bir karışık faz bulunmadığı ve

QD’lerin kübik yapıya sahip olduğu X-ışını kırınımı analizi ile doğrulandı. UV-visible absorpsiyon spektrumu ile

Cr katkılı QD’lere ait dalga boylarının saf ZnS QD’lere nazaran mavi kayma gösterdiği gözlemlendi. Baska bir

deyişle, ZnS QD’lerin yasak enerji aralığı Cr ile katkılandığında artış gösterdiği tespit edildi. Manyetik histerezis

ölçümleri ile, Cr katkılı ZnS QD’lerin, süperparamanyetik davranış sergiledikleri gösterildi. Ayrıca, Saf ve Cr

katkılı ZnS QD’lerin fotovoltaik özellikleri uyarılmış foton dönüşüm verimi (IPCE) ölçümleri ile incelendi. Elde

edilen sonuçlar, Cr katkılı ZnS QD’lerin güneş pillerinin performansını artırmak için duyarlaştırıcı olarak kullanılabileceğini

göstermektedir.

Keywords

• Cr katkılı ZnS,fotovoltaik,karakterizasyon,kuantum noktaları

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