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Title: Charge Separation Mechanisms in Ordered Films of Self-Assembled Donor–Acceptor Dyad Ribbons

Journal Article · · ACS Applied Materials and Interfaces

Orthogonal attachment of polar and nonpolar side-chains to a zinc porphyrin-perylenediimide dyad (ZnP-PDI, 1a) is shown herein to result in self-assembly of ordered supramolecular ribbons in which the ZnP and PDI molecules form segregated $$π$$-stacked columns. Following photoexcitation of the ordered ribbons, ZnP+•-PDI–• radical ion pairs form in <200 fs and subsequently produce a 30 ± 3% yield of free charge carriers that live for about 100 μs. Elongating the side chains on ZnP and PDI in 1b enhances the order of the films, but does not result in an increase in free charge carrier yield. In addition, this yield is independent of temperature, free energy of reaction, and the ZnP-PDI distance in the covalent dyad. These results suggest that the free charge carrier yield in this system is not limited by a bound charge transfer (CT) state or promoted by a vibronically hot CT state. Instead, it is likely that π-stacking of the segregated donors and acceptors within the ribbons results in delocalization of the charges following photoexcitation, allowing them to overcome Coulombic attraction and generate free charge carriers.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
FG02-99ER14999; DGE-1324585
OSTI ID:
1399126
Journal Information:
ACS Applied Materials and Interfaces, Vol. 9, Issue 39; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (65)

Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions journal December 1995
Conjugated Polymer-Based Organic Solar Cells journal April 2007
On the Efficiency Limit of Conjugated Polymer:Fullerene-Based Bulk Heterojunction Solar Cells journal January 2016
Charge generation in organic photovoltaics: a review of theory and computation journal January 2016
Charge Photogeneration in Organic Solar Cells journal November 2010
Mesoscopic Features of Charge Generation in Organic Semiconductors journal July 2014
The Role of Driving Energy and Delocalized States for Charge Separation in Organic Semiconductors journal February 2012
Hot charge-transfer excitons set the time limit for charge separation at donor/acceptor interfaces in organic photovoltaics journal December 2012
Charge Transfer State Versus Hot Exciton Dissociation in Polymer−Fullerene Blended Solar Cells journal August 2010
Compositional and Electric Field Dependence of the Dissociation of Charge Transfer Excitons in Alternating Polyfluorene Copolymer/Fullerene Blends journal May 2008
Ultrafast Long-Range Charge Separation in Organic Semiconductor Photovoltaic Diodes journal December 2013
Hot exciton dissociation in polymer solar cells journal December 2012
Electric field assisted dissociation of charge transfer states as a mechanism of photocarrier production journal May 1984
Barrierless Free Carrier Formation in an Organic Photovoltaic Material Measured with Ultrafast Vibrational Spectroscopy journal November 2009
Unequal Partnership: Asymmetric Roles of Polymeric Donor and Fullerene Acceptor in Generating Free Charge journal February 2014
Mechanism of Mobile Charge Carrier Generation in Blends of Conjugated Polymers and Fullerenes: Significance of Charge Delocalization and Excess Free Energy journal April 2012
On the Energetic Dependence of Charge Separation in Low-Band-Gap Polymer/Fullerene Blends journal October 2012
What Controls the Rate of Ultrafast Charge Transfer and Charge Separation Efficiency in Organic Photovoltaic Blends journal September 2016
Ultrafast Charge Separation in Organic Photovoltaics Enhanced by Charge Delocalization and Vibronically Hot Exciton Dissociation journal October 2013
Influence of Acceptor Structure on Barriers to Charge Separation in Organic Photovoltaic Materials journal January 2012
Photoinduced Electron Transfer in Self-Assembled Dimers of 3-Fold Symmetric Donor−Acceptor Molecules Based on Perylene-3,4:9,10-bis(dicarboximide) journal September 2004
Photoinitiated Charge Transport through π-Stacked Electron Conduits in Supramolecular Ordered Assemblies of Donor−Acceptor Triads journal August 2009
On the road towards electroactive covalent organic frameworks journal January 2014
Rationally synthesized two-dimensional polymers journal May 2013
Charge Dynamics in A Donor-Acceptor Covalent Organic Framework with Periodically Ordered Bicontinuous Heterojunctions journal January 2013
G-quadruplex organic frameworks journal December 2016
Stack Exchange Strategies for the Synthesis of Covalent Double-Channel Photosystems by Self-Organizing Surface-Initiated Polymerization journal November 2011
Long-lived charge carrier generation in ordered films of a covalent perylenediimide–diketopyrrolopyrrole–perylenediimide molecule journal January 2015
Top-down meets bottom-up: organized donor–acceptor heterojunctions for organic solar cells journal January 2012
Perylene Bisimide Dye Assemblies as Archetype Functional Supramolecular Materials journal August 2015
Use of Side-Chain Incompatibility for Tailoring Long-Range p/n Heterojunctions: Photoconductive Nanofibers Formed by Self-Assembly of an Amphiphilic Donor-Acceptor Dyad Consisting of Oligothiophene and Perylenediimide journal June 2010
Ultrafast Conformational Dynamics of Electron Transfer in ExBox 4+ ⊂Perylene journal November 2013
Scherrer grain-size analysis adapted to grazing-incidence scattering with area detectors journal October 2009
Singlet Fission via an Excimer-Like Intermediate in 3,6-Bis(thiophen-2-yl)diketopyrrolopyrrole Derivatives journal August 2016
The integration of kinetic rate equations by matrix methods journal May 1990
Charge Transport in Photofunctional Nanoparticles Self-Assembled from Zinc 5,10,15,20-Tetrakis(perylenediimide)porphyrin Building Blocks journal August 2002
The exciton model in molecular spectroscopy journal January 1965
Conjugated Porphyrin Ladders journal March 1994
Self-assembling hydrogel scaffolds for photocatalytic hydrogen production journal October 2014
Carbon-hydrogen stretching modes and the structure of n-alkyl chains. 1. Long, disordered chains journal December 1982
Fluorescence and FTIR Spectra Analysis of Trans-A2B2-Substituted Di- and Tetra-Phenyl Porphyrins journal August 2010
Excited Doublet States of Electrochemically Generated Aromatic Imide and Diimide Radical Anions journal July 2000
Dark Carriers, Trapping, and Activation Control of Carrier Recombination in Neat P3HT and P3HT:PCBM Blends journal October 2011
A strong regioregularity effect in self-organizing conjugated polymer films and high-efficiency polythiophene:fullerene solar cells journal February 2006
Transient optical studies of charge recombination dynamics in a polymer/fullerene composite at room temperature journal October 2002
Time-resolved EPR spectroscopy of electron spin polarized ZnTPP triplets oriented in a liquid crystal journal April 1985
Spin-Selective Charge Transport Pathways through p- Oligophenylene-Linked Donor−Bridge−Acceptor Molecules journal December 2009
Spin-polarized electron paramagnetic resonance spectra of radical pairs in micelles: observation of electron spin-spin interactions journal June 1987
Photoinduced Charge Carrier Generation and Decay in Sequentially Deposited Polymer/Fullerene Layers: Bulk Heterojunction vs Planar Interface journal March 2012
Bulk heterojunction solar cells with internal quantum efficiency approaching 100% journal April 2009
Conjugated Polymer Photovoltaic Cells journal November 2004
Charge Generation and Recombination Dynamics in Poly(3-hexylthiophene)/Fullerene Blend Films with Different Regioregularities and Morphologies journal May 2010
An Optimal Driving Force for Converting Excitons into Free Carriers in Excitonic Solar Cells journal April 2012
Reassessing the use of one-electron energetics in the design and characterization of organic photovoltaics journal January 2013
Multistep Photochemical Charge Separation in Rod-like Molecules Based on Aromatic Imides and Diimides journal January 1996
Coherent ultrafast charge transfer in an organic photovoltaic blend journal May 2014
Chemically Induced Dynamic Electron Polarization Study on the Mechanism of Exchange Interaction in Radical Ion Pairs Generated by Photoinduced Electron Transfer Reactions journal July 1999
Mapping the Influence of Molecular Structure on Rates of Electron Transfer Using Direct Measurements of the Electron Spin−Spin Exchange Interaction journal April 2003
Magnetic Field-Induced Switching of the Radical-Pair Intersystem Crossing Mechanism in a Donor−Bridge−Acceptor Molecule for Artificial Photosynthesis journal February 2011
Chemically induced dynamic electron polarization. Examples; of S-T±1 polarization journal May 1978
Temperature-Independent Charge Carrier Photogeneration in P3HT−PCBM Blends with Different Morphology journal March 2010
Charge Carrier Formation in Polythiophene/Fullerene Blend Films Studied by Transient Absorption Spectroscopy journal March 2008
Photoinduced Electron Transfer Reactions in a Porphyrin−Viologen Complex:  Observation of S 2 to S 1 Relaxation and Electron Transfer from the S 2 State journal April 1999
Influence of Anion Delocalization on Electron Transfer in a Covalent Porphyrin Donor–Perylenediimide Dimer Acceptor System journal January 2017
Molecular Packing Determines Charge Separation in a Liquid Crystalline Bisthiophene–Perylene Diimide Donor–Acceptor Material journal March 2016

Cited By (2)


Figures / Tables (9)