02075nas a2200193   4500008004100000022001400041245019500055210006900250260007100319300001400390490000800404520123700412100002001649700001801669700002101687700001701708700002401725856013201749       2015                        eng d  a1932-744700aUltrafast electron injection, hole transfer, and charge recombination dynamics in cdse QD super-sensitized Re(I)-polypyridyl complexes with catechol and resorcinol moiety: effect of coupling0 aUltrafast electron injection hole transfer and charge recombinat  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB  a3522-35290 v1193 a<p>Ultrafast charge-transfer dynamics have been demonstrated in CdSe quantum dots (QD) using two Re(I)-polypyridyl complexes having pendent catechol (Re1,2) and resorcinol (Re1,3) as the sensitizer molecules. The energy level diagram of CdSe QD and Re1,2 and Re1,3 sensitizer reveals that photoexcited hole of CdSe QD can be transferred to both Re1,2 and Re1,3 molecule, and photoexcited Re1,2 and Re1,3 can inject electron in the conduction band, which has been confirmed by steady-state and time-resolved photoluminescence studies with selective photoexcitation. Femtosecond transient absorption studies have been carried out to monitor charge-transfer dynamics in early time scale. Transient absorption spectra show formation of cation radicals for both Re1,2 and Re1,3 in the 550-650 nm region with a peak at 590 nm region and broad absorption in the 650-1000 nm region, which can be attributed to photoexcited electron in the conduction band of CdSe QD. Charge recombination was determined by monitoring the decay of cation radicals as well as decay of an electron and found to be slower in the Re1,3/CdSe system as compared to that of the Re1,2/CdSe system, which is due to weaker electronic coupling in the former system.</p>1 aDebnath, Tushar1 aMaity, Partha1 aBanerjee, Tanmay1 aDas, Amitava1 aGhosh, Hirendra, N.  uhttps://library.ncl.res.in/content/ultrafast-electron-injection-hole-transfer-and-charge-recombination-dynamics-cdse-qd-super-002663nas a2200193   4500008004100000022001400041245013100055210006900186260007100255300001600326490000800342520188900350100001802239700002002257700002102277700001702298700002402315856013002339       2016                        eng d  a1932-744700aCharge delocalization in the cascade band structure CdS/CdSe and CdS/CdTe core-shell sensitized with Re(I)-polypyridyl complex0 aCharge delocalization in the cascade band structure CdSCdSe and   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a10051-100610 v1203 a<p>Charge-carrier dynamics of CdS quantum dot (QD) and CdS/CdSe type-I and CdS/CdTe type-II core shell nanocrystals (NCs) sensitized with a Re(I)-polypyridyl complex have been carried with special emphasis on studies on carrier delocalization and the role of Re-complex as a hole acceptor and sensitizer molecule. Our investigation confirmed photoexcited hole transfer from CdS and CdS/CdSe to the Re-complex, while no hole transfer was observed in the CdS/CdTe Re-complex system. This was rationalized by the evaluation of the relative energy levels, which revealed that such hole migration was not energetically favorable due to low-lying highest occupied molecular orbital (HOMO) of the Re-complex as compared with the valence band (VB) of CdTe shell; however, luminescence quenching from upper excited states of Re-complex was observed in the presence of all three QD and core shell systems, which has been attributed to electron injection from hot state (energetically higher than the LUMO state) of the Re-complex to the conduction band (CB) of the QDs. Transient absorption (lambda(pump) = 400 nm, lambda(probe) = 450-750 nm) spectra recorded for Re complex-sensitized CdS and CdS/CdSe composite in the femtosecond time domain revealed a broad transient absorption band in the 580-750 nm region with a peak around 595 nm, and this was attributed to the cation radical formation for Re-complex, either by capturing photoexcited hole from the NCs or by injecting electron to the CB of the NCs. As anticipated, no such spectrum was observed for the CdS/CdTe Re-complex composite system after 400 nm excitation. Electron injection from photoexcited Re-complex to CdS QD and CdS/CdSe core shell was found to be &lt;100 fs, while the hole transfer from photoexcited CdS QD and CdS/CdSe core shell to Re-complex took place within the time scale of 900 fs and 2.5 ps, respectively.</p>1 aMaity, Partha1 aDebnath, Tushar1 aBanerjee, Tanmay1 aDas, Amitava1 aGhosh, Hirendra, N.  uhttps://library.ncl.res.in/content/charge-delocalization-cascade-band-structure-cdscdse-and-cdscdte-core-shell-sensitized-rei01234nas a2200361   4500008004100000022001400041245015900055210006900214260000800283490000700291653002100298653001200319653002900331653001500360653002600375653001700401100002100418700002300439700002400462700002400486700002200510700002300532700001600555700002000571700001900591700003000610700002200640700001600662700002200678700002200700700002400722856012600746       2024                        eng d  a1613-681000aInterface-centric strategies in kesterite solar cells: addressing challenges, solutions, and future directions for efficient solar-harvesting technologies0 aInterfacecentric strategies in kesterite solar cells addressing   cDEC0 v2010aband engineering10aDefects10ainterface loss mechanism10akesterites10arecombination control10asolar energy1 aJagadish, Kusuma1 aRahane, Ganesh, K.1 aKumar, Boddeda, Sai1 aBorkar, Durgesh, R.1 aChordiya, Kalyani1 aKavanagh, Sean, R.1 aRoy, Anurag1 aDebnath, Tushar1 aKolekar, Sadhu1 aKahaly, Mousumi, Upadhyay1 aMali, Sawanta, S.1 aPal, Shovon1 aGasparini, Nicola1 aDubal, Deepak, P.1 aRondiya, Sachin, R.  uhttps://library.ncl.res.in/content/interface-centric-strategies-kesterite-solar-cells-addressing-challenges-solutions-and