← Back to Search
The Effects Of Inorganic Surface Treatments On Photogenerated Carrier Mobility And Lifetime In PbSe Quantum Dot Thin Films
E. D. Goodwin, D. B. Straus, E. A. Gaulding, C. Murray, C. R. Kagan
Published 2016 · Chemistry
Save to my Library
Download PDFAnalyze on Scholarcy
Abstract We used flash-photolysis, time-resolved microwave conductivity (TRMC) to probe the carrier mobility and lifetime in PbSe quantum dot (QD) thin films treated with solutions of the metal salts of Na2Se and PbCl2. The metal salt treatments tuned the Pb:Se stoichiometry and swept the Fermi energy throughout the QD thin film bandgap. A stoichiometric imbalance favoring excess Se heavily p-doped the QD thin film, shifted the Fermi energy toward the valence band, and yielded the highest TRMC mobility and lifetime. Introducing Pb first compensated the p-doping and shifted the Fermi level through mid-gap, decreasing the TRMC mobility. Further Pb addition created an excess of Pb, n-doped the QD thin film, moved the Fermi level to near the conduction band, and again increased the TRMC mobility. The increase in TRMC mobility as the Fermi energy was shifted toward the band edges by non-stoichiometry is consistent with the QD thin film density of states.
This paper references
Thiocyanate-capped nanocrystal colloids: vibrational reporter of surface chemistry and solution-based route to enhanced coupling in nanocrystal solids.
Aaron T Fafarman (2011)
Highly effective surface passivation of PbSe quantum dots through reaction with molecular chlorine.
W. K. Bae (2012)
Wave-Number-Dependent Dielectric Function of Semiconductors
D. Penn (1962)
Solution-based stoichiometric control over charge transport in nanocrystalline CdSe devices.
D. Kim (2013)
Enhanced mobility-lifetime products in PbS colloidal quantum dot photovoltaics.
K. S. Jeong (2012)
The study of primary and secondary charge carriers in nanosecond pulse irradiated liquid dielectrics using a resonant microwave cavity
J. Warman (1977)
Controlling the Trap State Landscape of Colloidal CdSe Nanocrystals with Cadmium Halide Ligands
Matthew J. Greaney (2015)
Bandlike transport in strongly coupled and doped quantum dot solids: a route to high-performance thin-film electronics.
Ji-hyuk Choi (2012)
Infrared colloidal quantum dots for photovoltaics: fundamentals and recent progress.
J. Tang (2011)
Confined-but-connected quantum solids via controlled ligand displacement.
W. Baumgardner (2013)
Effect of metal ions on photoluminescence, charge transport, magnetic and catalytic properties of all-inorganic colloidal nanocrystals and nanocrystal solids.
Angshuman Nag (2012)
Electroluminescence from single monolayers of nanocrystals in molecular organic devices
S. Coe (2002)
Enhanced thermopower in PbSe nanocrystal quantum dot superlattices.
Robert Y. Wang (2008)
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
V. Colvin (1994)
Size-dependent energy band gap and dielectric constant within the generalized Penn model applied to a semiconductor nanocrystallite
A. Sharma (2006)
Free charges produced by carrier multiplication in strongly coupled PbSe quantum dot films.
Michiel Aerts (2011)
The detection of electrons in pulse irradiated liquid hydrocarbons by microwave absorption
J. Warman (1973)
Suppressed carrier scattering in CdS-encapsulated PbS nanocrystal films.
P. Moroz (2013)
N-type colloidal-quantum-dot solids for photovoltaics.
D. Zhitomirsky (2012)
Development of a microwave transmission setup for time-resolved measurements of the transient complex conductivity in bulk samples
J. M. Schins (2005)
Activating Carrier Multiplication in PbSe Quantum Dot Solids by Infilling with Atomic Layer Deposition.
Sybren ten Cate (2013)
Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots.
R. Ellingson (2005)
Highly Photoconductive CdSe Quantum-Dot Films: Influence of Capping Molecules and Film Preparation Procedure
E. Talgorn (2010)
Lifetime, mobility, and diffusion of photoexcited carriers in ligand-exchanged lead selenide nanocrystal films measured by time-resolved terahertz spectroscopy.
Glenn W. Guglietta (2015)
On the mechanism of lead chalcogenide nanocrystal formation.
J. S. Steckel (2006)
Role of bond adaptability in the passivation of colloidal quantum dot solids.
S. Thon (2013)
High efficiency carrier multiplication in PbSe nanocrystals: implications for solar energy conversion.
R. Schaller (2004)
Depleted bulk heterojunction colloidal quantum dot photovoltaics.
D. A. Barkhouse (2011)
Photodetectors based on treated CdSe quantum-dot films
D. Oertel (2005)
Time-resolved microwave conductivity. Part 2.—Quantum-sized TiO2 and the effect of adsorbates and light intensity on charge-carrier dynamics
S. Martin (1994)
Band-like transport, high electron mobility and high photoconductivity in all-inorganic nanocrystal arrays.
J. Lee (2011)
Theory of optical and microwave properties of microscopically inhomogeneous materials
I. Webman (1977)
Air-Stable All-Inorganic Nanocrystal Solar Cells Processed from Solution
Ilan Gur (2005)
Short-chain alcohols strip X-type ligands and quench the luminescence of PbSe and CdSe quantum dots, acetonitrile does not.
A. Hassinen (2012)
Charge transport in mixed CdSe and CdTe colloidal nanocrystal films
S. Geyer (2010)
Colloidal Nanocrystals with Molecular Metal Chalcogenide Surface Ligands
M. Kovalenko (2009)
Synthesis and Characterization of Monodisperse Nanocrystals and Close-Packed Nanocrystal Assemblies
C. Murray (2000)
Designing high-performance PbS and PbSe nanocrystal electronic devices through stepwise, post-synthesis, colloidal atomic layer deposition.
S. Oh (2014)
In situ repair of high-performance, flexible nanocrystal electronics for large-area fabrication and operation in air.
Ji-hyuk Choi (2013)
Hybrid passivated colloidal quantum dot solids.
A. Ip (2012)
Long-range orientation and atomic attachment of nanocrystals in 2D honeycomb superlattices
M. Boneschanscher (2014)
Controlled growth of tetrapod-branched inorganic nanocrystals
L. Manna (2003)
PbSe Nanocrystal Solids for n- and p-Channel Thin Film Field-Effect Transistors
D. Talapin (2005)
High charge-carrier mobility enables exploitation of carrier multiplication in quantum-dot films
C. Sandeep (2013)
Formation and stability of size-, shape-, and structure-controlled CdTe nanocrystals: Ligand effects on monomers and nanocrystals
W. Yu (2003)
Flexible and low-voltage integrated circuits constructed from high-performance nanocrystal transistors.
D. Kim (2012)
X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal Surface
J. B. Katari (1994)
Revealing the Dynamics of Charge Carriers in Polymer:Fullerene Blends Using Photoinduced Time-Resolved Microwave Conductivity
T. Savenije (2013)
Quantum junction solar cells.
J. Tang (2012)
Preparation and Characterization of Monodisperse PbSe Semiconductor Nanocrystals in a Noncoordinating Solvent.
W. Yu (2004)
Stoichiometric control of lead chalcogenide nanocrystal solids to enhance their electronic and optoelectronic device performance.
S. Oh (2013)
Effects of Post-Synthesis Processing on CdSe Nanocrystals and Their Solids: Correlation between Surface Chemistry and Optoelectronic Properties
E. D. Goodwin (2014)
Schottky solar cells based on colloidal nanocrystal films.
J. Luther (2008)
Ligand exchange and the stoichiometry of metal chalcogenide nanocrystals: spectroscopic observation of facile metal-carboxylate displacement and binding.
N. C. Anderson (2013)
Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites
C. Murray (1993)
Spectroscopic evaluation of surface functionalization efficiency in the preparation of mercaptopropyltrimethoxysilane self-assembled monolayers on glass.
P. Pallavicini (2009)
Surfactant ligand removal and rational fabrication of inorganically connected quantum dots.
H. Zhang (2011)
Engineering charge injection and charge transport for high performance PbSe nanocrystal thin film devices and circuits.
S. Oh (2014)
Colloidal-quantum-dot photovoltaics using atomic-ligand passivation.
J. Tang (2011)
Photoconductivity of PbSe quantum-dot solids: dependence on ligand anchor group and length.
Yunan Gao (2012)
Ultrasensitive solution-cast quantum dot photodetectors
G. Konstantatos (2006)
The study of the transient conductivity of pulse irradiated dielectric liquids on a nanosecond timescale using microwaves
P. Infelta (1977)
The study of charge carrier kinetics in semiconductors by microwave conductivity measurements
M. Kunst (1986)
Depleted-heterojunction colloidal quantum dot solar cells.
A. Pattantyus-Abraham (2010)
Solution-processed PbS quantum dot infrared photodetectors and photovoltaics
S. A. McDonald (2005)
PbSe quantum dot field-effect transistors with air-stable electron mobilities above 7 cm2 V(-1) s(-1).
Y. Liu (2013)
Unity quantum yield of photogenerated charges and band-like transport in quantum-dot solids.
E. Talgorn (2011)
This paper is referenced by
Electronic and structural investigation of nanocrystal thin films tuned via surface chemistry
E. Ashley Gaulding (2015)
Increased efficiency in pn-junction PbS QD solar cells via NaHS treatment of the p-type layer
M. Speirs (2017)
Investigating the Effect of Nanoscale Changes on the Chemistry and Energetics of Nanocrystals with a Novel Photoemission Spectroscopy Methodology
M. W. Liao (2017)
Exceeding Conventional Photovoltaic Efficiency Limits Using Colloidal Quantum Dots
G. Pach (2017)
Flexible colloidal nanocrystal electronics.
C. R. Kagan (2019)
Limits of Carrier Diffusion in n-Type and p-Type CH3NH3PbI3 Perovskite Single Crystals.
Octavi E. Semonin (2016)
Increased carrier mobility and lifetime in CdSe quantum dot thin films through surface trap passivation and doping.
D. B. Straus (2015)
Spectroelectrochemical Measurement of Surface Electrostatic Contributions to Colloidal CdSe Nanocrystal Redox Potentials
Gerard M. Carroll (2016)
Advanced Architecture for Colloidal PbS Quantum Dot Solar Cells Exploiting a CdSe Quantum Dot Buffer Layer.
T. Zhao (2016)
The influence of scattering layer thin film on photoelectric properties of Bi2S3/CdS/TiO2 electrode
P. Lv (2019)
Surface stoichiometry manipulation enhances solar hydrogen evolution of CdSe quantum dots
Mao-Yong Huang (2018)
Characterizing the Energetic Landscape in Solution Processable Solar Cells via Frequency Dependent Impedance Measurements
E. Wong (2018)
Unbalanced Hole and Electron Diffusion in Lead Bromide Perovskites.
Giselle A. Elbaz (2017)
Quantum Dot Solar Cell Fabrication Protocols
B. D. Chernomordik (2017)
Colloidal quantum dot solids for solution-processed solar cells
Mingjian Yuan (2016)