01986nas a2200157   4500008004100000245009800041210006900139260000800208300001600216490000700232520139200239100002901631700002001660700001901680856012901699       2019                        eng d00aInorganic metal iodide mediated solution phase surface passivation for quantum dot solar cell0 aInorganic metal iodide mediated solution phase surface passivati  cSEP  a16234-162430 v303 a<p>The recent advancements in solution phase surface passivation of quantum dots (QDs) enable the development of production compatible QD ink for their large-area deposition, of a single coating. Surface passivation and colloidal stability of the QDs in polar solvents have been achieved using inorganic-organic hybrid halometallate ligands. The inorganic halometallate anions bind to the unsaturated metal sites of the QD surface, while the organic counter cations provide the colloidal stability and charge balance to the QDs. Organic ligands is a reason for concern though for the stability of the QD solar cells processed from solution-phase ligand exchange. Here, we report a solution-phase ligand exchange strategy using alkali metal halides as a substitution for the organic counterpart to facilitate solution-phase ligand exchange using all-inorganic halometallate ligands. Considering the limited solubility of the alkali halides in organic solvents a two-stage ligand-exchanged process has been commenced to help remove the excess ligands, preserve the electronic purity and allow the formation of highly passivated QD films from solution-phase deposition. A twofold increase in solar cell performance is shown with the help of the modified ligand exchange approach. The solar cell properties are further analysed through detailed characterizations of the QD solar cells.</p>
1 aTulsani, Srikanth, Reddy1 aGanguly, Saptam1 aRath, Arup, K.  uhttps://library.ncl.res.in/content/inorganic-metal-iodide-mediated-solution-phase-surface-passivation-quantum-dot-solar-cell