2010
DOI: 10.1021/jp108165g
|View full text |Cite
|
Sign up to set email alerts
|

Spectroscopic Studies of Electron Injection in Quantum Dot Sensitized Mesoporous Oxide Films

Abstract: Optimization of interfacial charge transfer in quantum dot (QD) sensitized mesoporous oxide films is crucial for the efficient design of QD sensitized solar cells (QDSSC). We employ TeraHertz time-domain spectroscopy (THz-TDS), transient absorption (TA) and time-resolved luminescence measurements, combined with transmission electron microscopy (TEM) and current-voltage measurements to study injection of electrons from PbSe QDs that are chemically linked to mesoporous oxide films. We illustrate that the interpr… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1
1

Citation Types

5
93
1
1

Year Published

2011
2011
2022
2022

Publication Types

Select...
6
2

Relationship

0
8

Authors

Journals

citations
Cited by 52 publications
(100 citation statements)
references
References 53 publications
5
93
1
1
Order By: Relevance
“…It is clear that, given our current state of understanding of THz spectroscopy to these types of systems, future applications of time-resolved terahertz spectroscopy can focus on systems of increasing complexity, such as those encountered in photovoltaic devices where different semiconductor phases are intermixed on nanometer lengths scales (Esenturk et al, 2009). Such complex systems may include, for instance, semiconductor nanostructures (quantum dots or nanorods) embedded in an organic polymer semiconductor phase and quantum dot or dye-sensitized transition metal oxide systems (Tiwana et al, 2009;Nemec, Rochford et al, 2010;Pijpers et al, 2010Pijpers et al, , 2011. The ability to monitor exciton and carrier dynamics on ultrafast time scales, across a wide frequency range, without the necessity to apply contacts to the material makes time-resolved terahertz spectroscopy a rather unique tool for studying carrier dynamics, for instance, allowing us to monitor the conversion of excitons into free charge carriers and vice versa.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…It is clear that, given our current state of understanding of THz spectroscopy to these types of systems, future applications of time-resolved terahertz spectroscopy can focus on systems of increasing complexity, such as those encountered in photovoltaic devices where different semiconductor phases are intermixed on nanometer lengths scales (Esenturk et al, 2009). Such complex systems may include, for instance, semiconductor nanostructures (quantum dots or nanorods) embedded in an organic polymer semiconductor phase and quantum dot or dye-sensitized transition metal oxide systems (Tiwana et al, 2009;Nemec, Rochford et al, 2010;Pijpers et al, 2010Pijpers et al, , 2011. The ability to monitor exciton and carrier dynamics on ultrafast time scales, across a wide frequency range, without the necessity to apply contacts to the material makes time-resolved terahertz spectroscopy a rather unique tool for studying carrier dynamics, for instance, allowing us to monitor the conversion of excitons into free charge carriers and vice versa.…”
Section: Discussionmentioning
confidence: 99%
“…By monitoring the hole polarizability as a function of time after excitation, one can evaluate population dynamics of the hole states. This principle has been exploited by Pijpers et al, (2007Pijpers et al, ( , 2008 to study carrier multiplication in highly excited, small gap, InAs QDs. Moreover, coupling femtosecond optical pump-THz probe measurements with ultrafast optical spectroscopies (such as time-resolved luminescence or transient absorption) can therefore help separate hole from electron dynamics, which is generally challenging.…”
Section: Quantum Dotsmentioning
confidence: 99%
“…Hence, following optical excitation of the QD, the time-dependent pump-induced absorption of the THz probe in a QD-sensitized system can be directly correlated with ET from the QDs to the oxide. 14,33,35,36 Note that not only the ET rate but also the efficiency of the ET process can be obtained from OPTP measurements, through the amplitude of the photoinduced THz absorption (more details are given in the Supporting Information Figures S4 and S5). …”
mentioning
confidence: 99%
“…Depending on the band alignments, fast electron injection from the NC into the mesoporous film will occur, making it possible to use such superstructures as QDsensitized solar cells, akin to the well-known dye-sensitized Grätzel solar cells [144][145][146][147].…”
Section: Collective Effects In Nc Superstructures: When 1 1 1 Is Largmentioning
confidence: 99%