Comparative advantages of Zn–Cu–In–S alloy QDs in the construction of quantum dot-sensitized solar cells

Abstract

one sun irradiation, which was enhanced by 21%, and 82% in comparison to those of CIS/ZnS, and CIS based solar cells, respectively. In comparison to cell device assembled by the plain CIS and core/shell structured CIS/ZnS, the enhanced photovoltaic performance in ZCIS QDSCs is mainly ascribed to the faster photon generated electron injection rate from QD into TiO 2 substrate, and the effective restraint of charge recombination, as confirmed by incident photon-to-current conversion efficiency (IPCE), open-circuit voltage decay (OCVD), as well as electrochemical impedance spectroscopy (EIS) measurements.

Quantum dot-sensitized solar cells

“…116 Furthermore, they developed a Zn-Cu-In-S alloyed QD sensitizer, exhibiting a PCE of 8.55%. 220 It was demonstrated that alloyed structure is superior to that of the CIS/ZnS core/shell and pristine CIS QDs as sensitizer benefiting from the suppression of charge recombination as well as acceleration of electron injection efficiency. Up to now, this is the best efficiency for CIS QDs based QDSCs.…”

Zn‐Cu‐In‐S‐Se Quinary “Green” Alloyed Quantum‐Dot‐Sensitized Solar Cells with a Certified Efficiency of 14.4 %

“…Recently, Zhong et al. investigated the effects of core/shell and alloy structures of CIS QDs on the performance of QDSCs [34] . The results indicated that the Zn‐Cu‐In‐S (ZCIS) alloy QDs prepared by the cationic alloying approach was more effective in improving the QDSCs performance compared to the CIS/ZnS core/shell counterpart, arising from the higher photogenerated electron injection rate and the reduced charge recombination losses.…”

Zn‐Cu‐In‐S‐Se Quinary “Green” Alloyed Quantum‐Dot‐Sensitized Solar Cells with a Certified Efficiency of 14.4 %

“…To investigate the performance of different QDs in solar cells, QDSCs based on quinary ZCIS x Se 2− x and quaternary CISSe, ZCIS, and ZCISe QDs were fabricated and evaluated. The photovoltaic performance of cells based on single anion alloyed CISSe QDs was rather poor, with average PCE around only 9–10 % (Table S4), primarily due to the severe charge recombination and slow electron injection rate as demonstrated in previous reports [24, 34] . Therefore, we mainly discuss the performance of QDSCs based on ZCIS, ZCISe, and quinary ZCIS x Se 2− x QDs in the following section.…”