TY - JOUR
T1 - Enhancing Charge Carrier Delocalization in Perovskite Quantum Dot Solids with Energetically Aligned Conjugated Capping Ligands
AU - Vickers, Evan T.
AU - Enlow, Emily E.
AU - Delmas, William G.
AU - Dibenedetto, Albert C.
AU - Chowdhury, Ashraful H.
AU - Bahrami, Behzad
AU - Dreskin, Benjamin W.
AU - Graham, Thomas A.
AU - Hernandez, Isaak N.
AU - Carter, Sue A.
AU - Ghosh, Sayantani
AU - Qiao, Qiquan
AU - Zhang, Jin Z.
N1 - Funding Information:
This research was supported by NASA through MACES (NNX15AQ01A), the NSF (CHE-1904547), and UCSC Committee on Research Special Research Grant. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract DE-AC02-05CH11231. We acknowledge Dr. Tom Yuzvinsky for assistance with sample preparation and electron microscopy and the W.M. Keck Center for Nanoscale Optofluidics for use of the FEI Quanta 3D Dual beam microscope. Q.Q. acknowledges NSF MRI (1428992), NASA EPSCoR (NNX15AM83A), U.S.–Egypt Science and Technology (S&T) Joint Fund, SDBoR R&D Program and EDA University Center Program (ED18DEN3030025). We would like to thank Dr. Brian Moore for assisting us with high performance computing facility at South Dakota State University.
Funding Information:
This research was supported by NASA through MACES (NNX15AQ01A), the NSF (CHE-1904547), and UCSC Committee on Research Special Research Grant. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract DE-AC02-05CH11231. We acknowledge Dr. Tom Yuzvinsky for assistance with sample preparation and electron microscopy and the W.M. Keck Center for Nanoscale Optofluidics for use of the FEI Quanta 3D Dual beam microscope. Q.Q. acknowledges NSF MRI (1428992), NASA EPSCoR (NNX15AM83A), U.S.?Egypt Science and Technology (S&T) Joint Fund, SDBoR R&D Program and EDA University Center Program (ED18DEN3030025). We would like to thank Dr. Brian Moore for assisting us with high performance computing facility at South Dakota State University.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/3/13
Y1 - 2020/3/13
N2 - Compared to bulk perovskites, charge transport in perovskite quantum dot (PQD) solids is limited. To address this issue, energetically aligned capping ligands were used to prepare methylammonium lead bromide (MAPbBr3) PQDs toward enhancing surface charge carrier density in PQD solids. Trans-cinnamic acid (TCA) and its derivates, functionalized with electron-donating or electron-withdrawing groups to modulate energy levels, are used as passivating exciton-delocalizing ligands (EDLs) to decrease the energy gap with respect to the PQD core. 3,3-Diphenylpropylamine (DPPA) ligand is shown to stabilize EDLs on the PQD surface through π-πstacking intermolecular interaction, mitigating charge trapping and nonradiative decay. Passivation using EDLs in combination with DPPA increases the photoluminescence (PL) quantum yield (QY) (90%), photoconductivity, extraction, mobility, transport time, and lifetime of charge carriers in PQD solids. Prototype PQD-based light-emitting diodes (LEDs) were demonstrated with a low turn-on voltage of 2.5 V.
AB - Compared to bulk perovskites, charge transport in perovskite quantum dot (PQD) solids is limited. To address this issue, energetically aligned capping ligands were used to prepare methylammonium lead bromide (MAPbBr3) PQDs toward enhancing surface charge carrier density in PQD solids. Trans-cinnamic acid (TCA) and its derivates, functionalized with electron-donating or electron-withdrawing groups to modulate energy levels, are used as passivating exciton-delocalizing ligands (EDLs) to decrease the energy gap with respect to the PQD core. 3,3-Diphenylpropylamine (DPPA) ligand is shown to stabilize EDLs on the PQD surface through π-πstacking intermolecular interaction, mitigating charge trapping and nonradiative decay. Passivation using EDLs in combination with DPPA increases the photoluminescence (PL) quantum yield (QY) (90%), photoconductivity, extraction, mobility, transport time, and lifetime of charge carriers in PQD solids. Prototype PQD-based light-emitting diodes (LEDs) were demonstrated with a low turn-on voltage of 2.5 V.
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U2 - 10.1021/acsenergylett.0c00093
DO - 10.1021/acsenergylett.0c00093
M3 - Article
AN - SCOPUS:85080103254
SN - 2380-8195
VL - 5
SP - 817
EP - 825
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 3
ER -