Changduk Yang 교수

The synthesis of well-defined rod–coil block copolymers consisting of P3HT donor and C60 acceptor chromophores (P3HT-b-P(SxAy)-C60) in a molecular architecture is reported for use in bulk-heterojunction (BHJ) solar cells. In thin films of the resulting block copolymer, reproducible self-assembly into well-defined “nanofibrils” is observed. This is the first example of a block copolymer containing a C60 derivative that shows exclusively a nanofibrilar structure. We have investigated the potential

In the quest to improve the performance of polymer solar cells (PSCs) with a view to realizing economic viability, various solvent additives such as 1,8-octanedithiol (ODT), 1,8-diiodooctane (DIO), diphenylether (DPE) and 1-chloronaphthalene (CN) are used in easily obtainable poly(2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-dyl-alt-thiophene-2,5-diyl) (TQ1)-based systems with [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) as an acceptor to optimize the active layer nanomorphology. Utilizing a

Abstract High‐output triboelectric nanogenerators (TENGs) are demonstrated based on polyimide (PI)‐based polymers by introducing functionalities (e.g., electron‐withdrawing and electron‐donating groups) into the backbone. The TENG based on 6FDA‐APS PI, possessing the most negative electrostatic potential and the low‐lying lowest unoccupied molecular orbital level, produces the highest effective charge density of about 860 µC m −2 in practical working conditions with the ion injection process. Th

The enhanced SMA order ranges in well-intermixed 3-D textures enabled an ultrafast Channel II process, affording a highest efficiency of 12.01%.

Overlapping near-infrared absorption not only does not reduce short-circuit current density (JSC), but also can ensure a high average visible transmittance (AVT) and get a high open-circuit voltage (VOC) and power conversion efficiency (PCE) at the same time.

Two solid additives, BDT-1 and BDT-2, in non-fullerene polymer solar cells enhance photovoltaic efficiencies up to 16.26% with improved thermal and photoinduced stabilities.

A family of ladder-type π-excessive conjugated monomer (dicyclopentathienocarbazole (DCPTCz)) integrating the structural components of carbazole and thiophene into a single molecular entity is synthesized and polymerized by oxidative coupling to yield poly(dicyclopentathienocarbazole) (PDCPTCz). Moreover, through the careful selection of 2,1,3-benzothiadiazole unit as a π-deficient building block, the dicyclopentathienocarbazole-based donor–acceptor copolymer (poly(dicyclopentathienocarbazole-al

The efficiency of non-halogenated organic solar cells is improved from 17.1% to 19.4% after dibenzyl ether (DBE) additive treatment. More strikingly, the thick-film devices achieved a champion efficiency of 17.4%.

Through the esterification of an acyl chloride functionalized fullerene precursor with dendritic alcohol, a fullerene-rich dendron containing a norbornene unit at the focal point is prepared for ring-opening metathesis polymerization to obtain its linear polymer with a unimodal and narrow molar mass distribution (PDI = 1.08) by a progressive addition of catalysts.

The novel constitutional isomeric acceptors (<italic>o</italic>-F-ITIC and <italic>m</italic>-F-ITIC) are developed and they show the huge disparity of intermolecular interactions and/or arrangements with the donor polymer leading a significant variation in PCE of OSCs.

Abstract Defect states at the surface and grain boundaries of perovskite films have been known to be major determinants impairing the optoelectrical properties of perovskite films and the stability of perovskite solar cells (PeSCs). Herein, an n‐type conjugated small‐molecule additive based on fused‐unit dithienothiophen[3,2‐ b ]‐pyrrolobenzothiadiazole‐core (JY16) is developed for efficient and stable PeSCs, where JY16 possesses the same backbone as the widely used Y6 but with long‐linear n ‐he

p-Type semiconductor <bold>PBDB-T</bold> and its derivatives have been explored as dopant-free hole transport materials for CsPbI₂Br inorganic perovskite solar cells, with <bold>PBDB-T-Si</bold> enabling a PCE of 15.6% and FF exceeding 84%.

Benzothiadiazole-based solid additives have been designed as morphology controllers leading to enhanced power conversion efficiency and reduced device-to-device variations in small- and large-areas single cells.

Furan-flanked diketopyrrolopyrrole-based chalcogenophene copolymers are synthesized for the comprehensive study of the heterocyclic effect in organic field-effect transistors.