Department of Chemical and Biomolecular Engineering
Korea Advanced Institute of Science and Technology

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[cover picture] Design of Cyanovinylene-Containing Polymer Acceptors with Large Dipole Moment Change for Efficient Charge Generation in High-Performance All-Polymer Solar Cells

Title: Design of Cyanovinylene-Containing Polymer Acceptors with Large Dipole Moment Change forEfficient Charge Generation in High-Performance All-Polymer Solar Cells 

 

Author: Han-Hee Cho, SeonhaKim, Taesu Kim, Vijaya Gopalan Sree, Sung-Ho Jin, Felix Sunjoo Kim, and BumjoonJ. Kim* 

 

Journal: Advanced EnergyMaterials 2017, 8 (3), 1701436 

 

Abstract: Designing polymersthat facilitate exciton dissociation and charge transport is critical for theproduction of highly efficient all-polymer solar cells (all-PSCs). Here, thedevelopment of a new class of high-performance naphthalenediimide (NDI)-basedpolymers with large dipole moment change (Δµge) anddelocalized lowest unoccupied molecular orbital (LUMO) as electron acceptorsfor all-PSCs is reported. A series of NDI-based copolymers incorporatingelectron-withdrawing cyanovinylene groups into the backbone (PNDITCVT-R) isdesigned and synthesized with 2-hexyldecyl (R = HD) and 2-octyldodecyl (R = OD)side chains. Density functional theory calculations reveal an enhancement in Δµge and delocalization of the LUMO upon the incorporation of cyanovinylenegroups. All-PSCs fabricated from these new NDI-based polymer acceptors exhibitoutstanding power conversion efficiencies (7.4%) and high fill factors (65%),which is attributed to efficient exciton dissociation, well-balanced chargetransport, and suppressed monomolecular recombination. Morphological studies bygrazing X-ray scattering and resonant soft X-ray scattering measurements showthe blend films containing polymer donor and PNDITCVT-R acceptors to exhibitfavorable face-on orientation and well-mixed morphology with small domainspacing (3040 nm). 

 

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등록일2018-02-01

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Light-Emitting Diodes: Simultaneously Enhancing Light Extraction and Device Stability of Organic Light-Emitting Diodes using a Corrugated Polymer Nanosphere Templated PEDOT:PSS Layer (Adv. Energy Mater. 8/2014) Changyeon Lee, Dong Jin Kang, Hyunbum Kang, Taesu Kim, Junwoo Park, Jaeho Lee, Seunghyup Yoo and Bumjoon J. Kim Article first published online: 3 JUN 2014 | DOI: 10.1002/aenm.2014...
Microcapsules: Osmocapsules for Direct Measurement of Osmotic Strength (Small 6/2014) (page 1232) Shin-Hyun Kim, Tae Yong Lee and Sang Seok Lee Article first published online: 24 MAR 2014 | DOI: 10.1002/smll.201470037 [ABSTRACT] Osmocapsules are microfluidically created to provide a tool for direct measurement of osmotic pressure. As reported by S.-H. Kim and co-workers on page 1155,...
Hierarchical Structures: 3D Hierarchical Architectures Prepared by Single Exposure Through a Highly Durable Colloidal Phase Mask (Adv. Mater. 9/2014) Tae Yoon Jeon, Hwan Chul Jeon, Su Yeon Lee, Tae Soup Shim, Jung-Dae Kwon, Sung-Gyu Park, Seung-Man Yang Article first published online: 4 MAR 2014 DOI: 10.1002/adma.201470058 [ABSTRACT] A simple and cost-effective fabrication of 3...
Droplet Microfluidics for Producing Functional Microparticles  Ju Hyeon Kim, Tae Yoon Jeon, Tae Min Choi, Tae Soup Shim, Shin-Hyun Kim, and Seung-Man Yang [ABSTRACT] Isotropic microparticles prepared from a suspension that undergoes polymerization have long been used for a variety ofapplications. Bulk emulsification procedures produce polydisperse emulsion droplets that are transfor...
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