Oxygenated cadmium sulfide (CdS:O) is an alternative CdTe window layer that delivers improved blue response relative to CdS. Our recent study revealed that CdS: O completely transforms during device fabrication into a...
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ISBN:
(纸本)9781509027255
Oxygenated cadmium sulfide (CdS:O) is an alternative CdTe window layer that delivers improved blue response relative to CdS. Our recent study revealed that CdS: O completely transforms during device fabrication into a layer containing cadmium sulfate clusters interspersed among CdS 1-y Te y nanocrystals. This motivated us to study CdTe solar cells employing pre-formed CdS 1-y Te y alloy windows without sulfate present. The intrinsic properties of alloys deposited by co-evaporation are evaluated and then used in place of CdS in standard device fabrication. Interestingly we find that device efficiency is nominally unchanged, but there are significant tradeoffs between current collection, fill factor, and open circuit voltage with alloy composition. XRD analysis of interdiffusion with CdTe is performed and the results show that it is largely suppressed in alloy-based devices.
A system-level framework of complex microbe-microbe and host-microbe chemical cross-talk would help elucidate the role of our gut microbiota in health and disease. Here we report a literature-curated interspecies netw...
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Recently, all-inorganic perovskites CsPbX3 (X= Cl, Br and I) quantum dots (QDs) have drawn great attentions because of their PL spectra tunable over the whole visible spectral region (400-700 nm) and adjustable bandga...
Recently, all-inorganic perovskites CsPbX3 (X= Cl, Br and I) quantum dots (QDs) have drawn great attentions because of their PL spectra tunable over the whole visible spectral region (400-700 nm) and adjustable bandgap, which revealed a promising potential on the field of photoelectronic devices, such as solar cells, LEDs and sensors. In this paper, CsPbX3 QDs and hybrid QDs, CsPbClxBr3-x and CsPbBrxI3-x were synthesized via one-step and two-step methods comparably. The optical bandgaps of CsPbCl3, CsPbBr3, and CsPbI3, were calculated as 3.08, 2.36, and 1.73eV, respectively, based on the Tauc's equation and UV absorption spectra. Ionic displacement and phase transformation occurred during the mixing process were found based on the monitoring of PL spectra and HRTEM characterization. The long-term stability, dried, high quality and two-dimensional hybrid CsPbBrxI3-x QDs powders could be achieved via the two-step method. Polar solution inductions were used to wash and purify the CsPbX3 QDs, which help obtain of various compositions and well crystallize all-inorganic perovskites QDs powders.
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