01840nas a2200169   4500008004100000022001400041245012100055210006900176260007100245300001600316490000800332520113900340100001901479700001701498700002401515856013101539       2014                        eng d  a1932-744700aSize quantization effects on interfacial electron transfer dynamics in Ru(II)-polypyridyl complex sensitized ZnO QDs0 aSize quantization effects on interfacial electron transfer dynam  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC  a28898-289050 v1183 a<p>Quantum-size confinement in semiconductor material offers size based tunability of interband gap energy as well as intraband sublevels. In this work, size quantization of wide bandgap ZnO quantum dots has been explored in the study of interfacial charge separation reaction using a catechol functionalized Ru(II)polypyridyl complex as a photosensitizer molecule. Femtosecond time-resolved transient absorption studies have revealed multiple electron injection events based on discrete conduction band states of ZnO QDs. The electron injection rates have been rationalized for quantum confinement effects owing to different sizes of ZnO QDs. Furthermore, the size dependency of the intrinsic lifetime of electrons injected into discrete energy levels of ZnO QDs has been revealed in charge recombination reaction with the Ru(III)polypyridyl complex cation. The charge recombination dynamics reveals a competing trend of carrier confinement and carrier leak upon reducing particle size. This study shows the optimization of finite size effects in achieving better interfacial charge separation at the dye/semiconductor interface.</p>1 aVerma, Sandeep1 aDas, Amitava1 aGhosh, Hirendra, N.  uhttps://library.ncl.res.in/content/size-quantization-effects-interfacial-electron-transfer-dynamics-ruii-polypyridyl-complex-0