Aqueous synthesis of alloyed CdSexTe1-x colloidal quantum dots and their In-situ assembly within mesoporous TiO2 for solar cells

Near‐Infrared Photoactive Semiconductor Quantum Dots for Solar Cells

“…Alloying: Alloying is a common strategy for designing and optimizing the photoelectric properties of materials. [25,121] As stated earlier, alloying affords excellent characteristics such as tunable composition, optical bowing effect, and lattice structure hardening, making alloyed QDs ideal photovoltaic materials. In particular, alloyed QDs allow significant band tailoring through the composition variation without changing the particle size, so as to broaden the photon harvesting range and improve the charge injection efficiency.…”

“…Compared with binary CdSe and CdTe, the NIR photoactive CdSe x Te 1-x alloy sensitizer exhibits a wider absorption range, higher CB energy level and good chemical stability. [119][120][121] Mac-Donald et al developed CdSe x Te 1-x alloys with tunable bandgap through layer-by-layer deposition of CdTe and CdSe QDs to fabricate photovoltaic devices, yielding an impressive efficiency of 7.1%. [119] The CdSe x Te 1-x alloys show a spectral response toward the NIR part.…”

“…including CdSe x Te 1-x , PbS x Se 1-x , Cd 1-x Pb x S, CuInSe x S 2-x , Zn-Cu-In-Se, Cu-In-Ga-Se, Zn-Cu-In-S-Se, etc., have been successfully developed for solar cells. [25,55,99,100,121,167] For example, Song et al designed and fabricated alloyed Zn-Cu-In-S-Se quinary "green" QDs by cation/anion co-alloying strategy for liquid-junction QDSCs, as shown in Figure 13. [167] The CB of the quinary QD is located between those of quaternary QDs, giving rise to the favorable driving force for electron injection from QDs into TiO 2 , together with broadband light harvesting covering the NIR part.…”

Efficient PbS colloidal quantum dot solar cells employing Cu2O as hole transport layer

“…The material size can easily regulate the extinction coefficients and absorption spectrum of QDs (Peng et al 2000). Due to the quantum confinement effect, alterations in the size of QDs can be made to tune the bandgap (Song et al 2020). Despite all these great efforts made to date, the PCE obtained is still very low and hence need a lot of efforts to reach its maximum theoretical value.…”

Influence of precursor ratio and dopant concentration on the structure and optical properties of Cu-doped ZnCdSe-alloyed quantum dots

“…Various synthesis routes are effective for the preparation of ternary QDs like solid-state reaction, solvothermal, thermolysis, and hot injection techniques. [10][11][12][13] Most of the methods for synthesis of ternary QDs follow two-step methods: (i) forming the core/shell structure and (ii) further heating to form an alloy. 14 But for the production of large-scale QDs, one-step method is always preferred over two-step method.…”