Han‐Hee Cho

Conjugated polymers, in general, are unstable when exposed to air, solvent, or thermal treatment, and these challenges limit their practical applications. Therefore, it is of great importance to develop new materials or methodologies that can enable organic electronics with air stability, solvent resistance, and thermal stability. Herein, we have developed a simple but powerful approach to achieve solvent-resistant and thermally stable organic electronic devices with a remarkably improved air st

A new series of donor–acceptor (D–A) conjugated random terpolymers (PBDTT–DPP–TPD) were synthesized from electron-rich thienyl-substituted benzo[1,2- b:4,5- b ′]dithiophene (BDTT), in conjugation with two electron-deficient units, pyrrolo[3,4- c ]pyrrole-1,4-dione (DPP) and thieno[3,4- c ]pyrrole-4,6-dione (TPD), of different electron-withdrawing strengths. The optical properties of these random terpolymers can be easily controlled by tuning the ratio between DPP and TPD; an increase in TPD indu

Abstract Designing polymers that facilitate exciton dissociation and charge transport is critical for the production of highly efficient all‐polymer solar cells (all‐PSCs). Here, the development of a new class of high‐performance naphthalenediimide (NDI)‐based polymers with large dipole moment change (Δ µ ge ) and delocalized lowest unoccupied molecular orbital (LUMO) as electron acceptors for all‐PSCs is reported. A series of NDI‐based copolymers incorporating electron‐withdrawing cyanovinylene

The surface properties of graphene quantum dots (GQDs) control their dispersion and location within the matrices of organic molecules and polymers, thereby determining various properties of the hybrid materials. Herein, we developed a facile, one-step method for achieving systematic control of the surface properties of highly fluorescent GQDs. The surfaces of the as-synthesized hydrophilic GQDs were modified precisely depending on the number of grafted hydrophobic hexylamine. The geometry of the

Intermolecular interactions have a critical role in determining the molecular packing and orientation of conjugated polymers and organic molecules, leading to significant changes in their electrical and optical properties. Herein, we investigated the effects of intermolecular interactions of electron-donating small molecules on their structural, optical, and electrical properties, as well as on their performance in organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). A seri

Systematic control of the chemical structure of conjugated polymers is critically important to elucidate the relationship between the conjugated polymer structures and properties and to optimize their performance in bulk heterojunction (BHJ) polymer solar cell (PSC) devices. Herein, we synthesized three new copolymers, i.e., P0, P1, and P2; these copolymers contain the same benzodithiophene donor unit but have different acceptor units with different numbers of nitrogen atoms in the range of 0–2.

We designed and synthesized a series of n-type conjugated polymers by introducing phenylnaphthalenediimide (PNDI) as a novel n-type building block, and investigated the effect of side-chain engineering in the polymer acceptor on the performance of all-polymer solar cells (all-PSCs).

Solar fuel production involving the conversion of solar energy directly into chemical fuels such as hydrogen and valuable chemicals using photoelectrochemical (PEC) cells and photocatalysts (PCs) offers a promising avenue for sustainable energy while reducing carbon emissions. However, existing PEC cells and PCs fall short of economic viability due to their low solar-to-chemical (STC) conversion efficiency associated with the employed semiconductors, highlighting the clear need for identifying i

We have developed a simple yet versatile approach for enhancing the performance of all-polymer solar cells (all-PSCs) using a highly crystalline small-molecular additive, 6,6′-dithiopheneisoindigo (DTI).

Abstract Charge‐selective contacts critically influence carrier dynamics and overall performance in halide perovskite solar cells (PSCs). Self‐assembled monolayers (SAMs) have emerged as a powerful strategy for precise interfacial engineering, enabling tailored energy level alignment and interfacial interactions to enhance charge extraction. Despite their promise, clear structure–function relationships for SAMs—particularly as electron‐selective contacts (ESCs)—remain poorly developed. Here, a s

Layered halide perovskites (LHPs) are emerging semiconductor materials due to their superior environmental stability compared to that of traditional halide perovskites. While LHPs have tunable optoelectronic properties, quantum and dielectric confinement effects due to organic spacer layers limit their application. Recent attempts to mitigate the high exciton binding energy ( E b ) of LHPs by organic cation engineering have been demonstrated; however, systematic studies to decouple the influence

In article number 1701436 by Bumjoon J. Kim and co-workers, a series of naphthalenediimide-based polymer acceptors with superior electron mobility and large dipole moment difference is developed by incorporating electron-withdrawing cyanovinylene groups into a polymer backbone. All-polymer solar cells based on these polymers generate outstanding power conversion efficiency of 7.4% with high fill factor (65%), by virtue of the high electron transport and efficient exciton dissociation with greatl