Highly Efficient Zn–Cu–In–Se Quantum Dot-Sensitized Solar Cells through Surface Capping with Ascorbic Acid

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Abstract
The balance between band structure, composition and defect is essential for improving the optoelectronic properties of ternary and quaternary quantum dots and the corresponding photovoltaic performance. In this work, ascorbic acid (AA) as capping ligand is introduced into the reaction system to prepare green Zn-Cu-In-Se (ZCISe) quantum dots. Results show that the addition of AA can increase the Zn content while decrease In content, resulting in the enlarged band gap, high conduction band energy level and suppressed charge recombination. When AA/Cu ratio is 1, the quantum dots possess the largest band gap of 1.49 eV and the assembled quantum dot sensitized solar cells exhibit superior photovoltaic performance with ~ 17% increment mainly contributed by the dramatically increased current density. The new record efficiency of 10.44% and 13.85% are obtained from the ZCISe cells assembled with brass and titanium mesh based counter electrodes respectively.
Funding Information
  • Science and Technology Commission of Shanghai Municipality (18ZR1409200)

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