Photoluminescence Properties and Its Origin of AgInS<sub>2</sub> Quantum Dots with Chalcopyrite Structure

Hamanaka, Yasushi; Ogawa, Tetsuya; Tsuzuki, Masakazu; Kuzuya, Toshihiro

doi:10.1021/jp110409q

Cited by 257 publications

(357 citation statements)

References 61 publications

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“…The fast decay was assigned to nonradiation transition that was largely eliminated by ZnS growth and so can be associated with a surface state. The other slow decay was dominated after ZnS growth, meaning that it originated from band to donor/acceptor or donor-acceptor emission [24,53]. Both time constants determined in this study for the fast and slow decays as well as the time scale of the decay agree well with other studies [24,52,53].…”

Section: Pl Dynamicssupporting

confidence: 88%

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Luan

et al. 2016

Green Processing and Synthesis

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CuInS 2 /ZnS (CIS/ZnS) quantum dots (QDs) with high photoluminescence (PL) were synthesized via a facile solvothermal approach. Gaussian deconvolution of PL spectra, transmission electron microscopy, and timeresolved PL spectroscopies were used to characterize the emission properties of the prepared CIS and CIS/ZnS QDs. It was found that the growth of ZnS can reduce the surface defect acting as traps to minimize donor-acceptor emissions, and the contribution of band to donor/acceptor transition becomes a dominating emission with the increase of shell growth time. The blue shift of PL emission wavelength of CIS/ZnS QDs underwent two steps: the dramatic blue shift originated from the decreased fraction donor-acceptor transition due to the reduction of surface defects at the beginning and the subsequently mild blueshift with the time from the interdiffusion of CIS and ZnS. The effect of trioctylphosphine (TOP) and dodecanethiol (DDT) as ligands during shell growth on the optical properties of QDs were investigated and compared. The PL quantum yield (QY) of CIS core affects the final value of CIS/ ZnS QDs, and the higher PL QY is achieved while using CIS core with higher PL QY. Based on the selected ligand DDT, the reaction parameters, such as CIS core reaction time, shell growth time, and Zn/Cu feed molar ratio, were further optimized. CIS/ZnS QDs with high PL QY can be obtained with a Zn/Cu feed molar ratio larger than 4, shell growth time of 30 to 90 min, and shell growth temperature 220°C-240°C, and the maximum value was up to about 80% by adjusting the above-mentioned parameters.

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Section: Pl Dynamicssupporting

confidence: 88%

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Luan

et al. 2016

Green Processing and Synthesis

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“…20 This results in emission from defect levels and extremely broadened emission bands owing to the strong electronphonon interactions. 21 The emission full width at half maximum of a typical ternary QDs is 100 nm, while that of a CdSe QD is approximately 30 nm. 8,14 Thus, suitable alternative material systems to CdSe have not yet been established.…”

Section: Introductionmentioning

confidence: 99%

Design of cadmium-free colloidal II–VI semiconductor quantum dots exhibiting RGB emission

Asano

Omata

2017

AIP Advances

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The size and composition dependence of the optical gap of colloidal alloyed quantum dots (QDs) of Zn(Te1−xSex) and Zn(Te1−xSx) were calculated by the finite-depth-well effective mass approximation method. QDs that exhibited red, green and blue emission were explored to develop cadmium-free II–VI chalcogenide-based QD-phosphors. We considered that highly monodisperse colloidal QDs with diameters of 3–6 nm are easy to synthesize and II–VI semiconductor QDs usually exhibit a Stokes shift ranging between 50 and 150 meV. We showed that Zn(Te1−xSex) QDs with 0.02≤x≤0.68, and 0≤x≤0.06, and 0.66≤x≤0.9 may be expected to exhibit green, and blue emission, respectively. Zn(Te1−xSx) QDs with 0.26≤x≤0.37, 0.01≤x≤0.2 and 0.45≤x≤0.61, 0≤x≤0.02, and 0.63≤x≤0.72, should give red, green and blue emission respectively. On the basis of our calculations, we showed that Zn(Te,Se) and Zn(Te,S) QDs are very promising cadmium-free II-VI chalcogenide semiconductor QD phosphors.

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“…To date, a few ternary semiconductor QDs have been reported in the field of solar cells [30]. Inspired by these researches, the ternary I-III-VI QDs of A I B III C 2 VI (A = Cu, Ag; B = Al, Ga, In; C = S, Se, Te) chalcopyrite semiconductors are expected to exhibit excellent optical properties [31,32]. Recently, some of them have been reported applied on solar cells, such as CuInS 2 , CuInSe 2 , CuInSe x S 2−x and CuIn x Ga (1−x) S 2 [33][34][35][36][37][38], which attracted great attention to serve as Pb/Cd-free light-harvesting materials in QDSSCs.…”

Section: Introductionmentioning

confidence: 99%

Enhanced performance of solar cells via anchoring CuGaS2 quantum dots

et al. 2017

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Ternary I-III-VI quantum dots (QDs) of chalcopyrite semiconductors exhibit excellent optical properties in solar cells. In this study, ternary chalcopyrite CuGaS 2 nanocrystals (2-5 nm) were one-pot anchored on TiO 2 nanoparticles (TiO 2 @CGS) without any long ligand. The solar cell with TiO 2 @CuGaS 2 /N719 has a power conversion efficiency of 7.4%, which is 23% higher than that of monosensitized dye solar cell. Anchoring CuGaS 2 QDs on semiconductor nanoparticles to form QDs/dye co-sensitized solar cells is a promising and feasible approach to enhance light absorption, charge carrier generation as well as to facilitate electron injection comparing to conventional mono-dye sensitized solar cells.

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Photoluminescence Properties and Its Origin of AgInS₂ Quantum Dots with Chalcopyrite Structure

Cited by 257 publications

References 61 publications

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Design of cadmium-free colloidal II–VI semiconductor quantum dots exhibiting RGB emission

Enhanced performance of solar cells via anchoring CuGaS2 quantum dots

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Photoluminescence Properties and Its Origin of AgInS2 Quantum Dots with Chalcopyrite Structure

Cited by 257 publications

References 61 publications

Optimization of the recipe for the synthesis of CuInS2/ZnS nanocrystals supported by mechanistic considerations

Optimization of the recipe for the synthesis of CuInS2/ZnS nanocrystals supported by mechanistic considerations

Design of cadmium-free colloidal II–VI semiconductor quantum dots exhibiting RGB emission

Enhanced performance of solar cells via anchoring CuGaS2 quantum dots

Contact Info

Product

Resources

About

Photoluminescence Properties and Its Origin of AgInS₂ Quantum Dots with Chalcopyrite Structure

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations