Bandtail broadening originating from increasing the polydispersity of colloidal quantum dots (CQDs) deteriorates open-circuit voltage (V OC) and hinders charge-carrier transport in CQD photovoltaics. The development of colloidal synthetic routes has enabled preparing monodisperse perovskite CQDs (Pe-CQDs) that have attracted attention as promising absorbers in CQD photovoltaics. However, polar-antisolvent-based purification induces the dissolution and agglomeration of Pe-CQDs, resulting in an irregular size distribution. Consequently, the photovoltaic performance decreases because of the increase in Pe-CQD polydispersity. Here, we demonstrate the preparation of well-purified monodisperse CsPbI3-Pe-CQDs via size selection on the basis of gel permeation chromatography. Well-purified monodisperse Pe-CQDs exhibit improved photovoltaic performance and achieve a low Pe-CQD polydispersity. Furthermore, these Pe-CQDs show higher photoluminescence quantum yields, narrower full-widths at half-maximum, and lower Urbach energies, in comparison to irregular-sized Pe-CQDs without size selection. Therefore, CsPbI3-Pe-CQD solar cells comprising monodisperse Pe-CQDs show the highest power conversion efficiency (15.3%) and V OC (1.27 V) among the fully inorganic CsPbI3-Pe-CQD solar cells reported so far.
This paper demonstrates fabrication of silica-shell-coated magnetic nanoparticle clusters (SMNCs) and subsequent surface engineering of SMNCs to produce surface-modified SMNCs that have zwitterionic and primary amine ligands (SMNC-ZW/Am). SMNC-ZW/Am was passivated by zwitterionic ligands for improved colloidal stability and reduced nonspecific adsorption and by primary amine ligands for facilitated conjugation with biomolecules. Hydrodynamic (HD) size and zeta potential of SMNC-ZW/Am could be flexibly tuned by controlling the relative amounts of zwitterionic and primary amine ligands. SMNC-ZW/Am had higher colloidal stability in high salt concentration and broad pH range than did bare SMNC. Nonspecific adsorption with biomolecules onto SMNC-ZW/Am surface was significantly suppressed by the zwitterionic ligands. The facile bioconjugation capability of SWNC-ZW/Am enabled conjugation of biotin and antibody to the SWNC-ZW/Am surface. Biomolecule-conjugated SMNC-ZW/Am showed specific binding affinity to streptavidin and Salmonella bacteria, with reduced nonspecific adsorption; therefore, SWMC-ZW/Am has potential use as an antifouling nanosubstrate for separation and bioanalysis.
Photoelectrochemical (PEC) hydrogen production via water splitting is a promising sustainable energy conversion method. However, most semiconductors used as photoanodes in PEC splitting exhibit several drawbacks, including ultraviolet (UV)-limited activity, toxic components, and complicated material processing. To address these issues, this study presents a photoanode design strategy for visible-light-driven PEC water splitting in aqueous Na2SO4 solution using a solution-processable AgBiS2 nanocrystal (NC) photoanode. It was observed that the characteristics of the ligand used for the AgBiS2 NC photoanode are crucial in determining its PEC water splitting performance. Moreover, the thiol ligand-capped AgBiS2 NC photoanode shows a higher photocurrent density (J ph) in both 1 sun and visible light than typical TiO2 or Bi2S3 NC photoanodes owing to its excellent electron collection ability and low interfacial charge transfer resistance. The AgBiS2 NC photoanode emits 91% of J ph under visible and near-IR light, whereas the Bi2S3 NC photoanodes exhibited a J ph of 67% under the same conditions, demonstrating the superiority of AgBiS2 NC materials for application in highly efficient visible-light-driven PEC devices.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.