Improving the performance of quantum dot sensitized solar cells through CdNiS quantum dots with reduced recombination and enhanced electron lifetime

Chandu V.V.M. Gopi, Mallineni Venkata-Haritha, Hyunwoong Seo, Saurabh Singh, Soo Kyoung Kim, Masaharu Shiratani, Hee Je Kim

Research output: Contribution to journalArticle

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Abstract

To make quantum dot-sensitized solar cells (QDSSCs) competitive, we investigated the effect of Ni2+ ion incorporation into a CdS layer to create long-lived charge carriers and reduce the electron-hole recombination. The Ni2+-doped CdS (simplified as CdNiS) QD layer was introduced to a TiO2 surface via the simple successive ionic layer adsorption and reaction (SILAR) method in order to introduce intermediate-energy levels in the QDs. The effects of different Ni2+ concentrations (5, 10, 15, and 20 mM) on the physical, chemical, and photovoltaic properties of the QDSSCs were investigated. The Ni2+ dopant improves the light absorption of the device, accelerates the electron injection kinetics, and reduces the charge recombination, which results in improved charge transfer and collection. The 15% CdNiS cell exhibits the best photovoltaic performance with a power conversion efficiency (η) of 3.11% (JSC = 8.91 mA cm-2, VOC = 0.643 V, FF = 0.543) under one full sun illumination (AM 1.5 G). These results are among the best achieved for CdS-based QDSSCs. Electrochemical impedance spectroscopy (EIS) and open circuit voltage decay (OCVD) measurements confirm that the Ni2+ dopant can suppress charge recombination, prolong the electron lifetime, and improve the power conversion efficiency of the cells.

Original languageEnglish
Pages (from-to)8447-8457
Number of pages11
JournalDalton Transactions
Volume45
Issue number20
DOIs
Publication statusPublished - Jan 1 2016

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Semiconductor quantum dots
Solar cells
Conversion efficiency
Electrons
Doping (additives)
Electron injection
Open circuit voltage
Charge carriers
Volatile organic compounds
Electrochemical impedance spectroscopy
Sun
Light absorption
Electron energy levels
Charge transfer
Lighting
Ions
Adsorption
Kinetics

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

Cite this

Improving the performance of quantum dot sensitized solar cells through CdNiS quantum dots with reduced recombination and enhanced electron lifetime. / Gopi, Chandu V.V.M.; Venkata-Haritha, Mallineni; Seo, Hyunwoong; Singh, Saurabh; Kim, Soo Kyoung; Shiratani, Masaharu; Kim, Hee Je.

In: Dalton Transactions, Vol. 45, No. 20, 01.01.2016, p. 8447-8457.

Research output: Contribution to journalArticle

Gopi, Chandu V.V.M. ; Venkata-Haritha, Mallineni ; Seo, Hyunwoong ; Singh, Saurabh ; Kim, Soo Kyoung ; Shiratani, Masaharu ; Kim, Hee Je. / Improving the performance of quantum dot sensitized solar cells through CdNiS quantum dots with reduced recombination and enhanced electron lifetime. In: Dalton Transactions. 2016 ; Vol. 45, No. 20. pp. 8447-8457.
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