Excitonic coupling dominates the homogeneous photoluminescence excitation linewidth in semicrystalline polymeric semiconductors

Charge separation by photoexcitation in semicrystalline polymeric semiconductors: An intrinsic or extrinsic mechanism?

We probe charge photogeneration and subsequent recombination dynamics in neat regioregular poly(3-hexylthiophene) films over six decades in time by means of time-resolved photoluminescence spectroscopy. Exciton dissociation at 10K occurs extrinsically at interfaces between molecularly ordered and disordered domains. Polaron pairs thus produced recombine by tunnelling with distributed rates governed by the distribution of electron-hole radii. Quantum-chemical calculations suggest that hot-exciton dissociation at such interfaces results from a high charge-transfer character.

Two-dimensional spatial coherence of excitons in semicrystalline polymeric semiconductors: The effect of molecular weight

The electronic properties of macromolecular semiconductor thin films depend profoundly on their solid-state microstructure, which in turn is governed, among other things, by the processing conditions selected and the polymer chemical nature and molecular weight. Specifically, low-molecular-weight materials form crystalline domains of cofacially $π$-stacked molecules, while the usually entangled nature of higher molecular-weight polymers leads to microstructures comprised of molecularly ordered crystallites interconnected by amorphous regions. Here, we examine the interplay between extended exc…

多相半结晶微结构驱动纯塑料半导体中的激子解离

Multi-phase semicrystalline microstructures drive exciton dissociation in neat plastic semiconductors

本研究通过时间分辨PL光谱揭示P3HT中分子量依赖的微结构（单相与两相）如何影响电荷光生与激子解离，发现两相界面无序区高度离域激子的非本征解离产率及分布与微结构密切相关。

揭示聚碳氮化物的光学特征：堆叠诱导激子跃迁的见解

Unraveling the Optical Signatures of Polymeric Carbon Nitrides: Insights into Stacking-Induced Excitonic Transitions

本研究通过ab initio计算揭示聚碳氮化物（PCNs）的结构诱导光学性质，发现缩合度与褶皱度影响电子/空穴局域化及π电子能级，并阐明了二维与三维结构间激子光物理过程的差异，为材料性能提升提供新见解。

Local tuning of WS2 photoluminescence using polymeric micro-actuators in a monolithic van der Waals heterostructure

The control of the local strain profile in 2D materials offers an invaluable tool for tailoring the electronic and photonic properties of solid-state devices. In this paper, we demonstrate a local engineering of the exciton photoluminescence (PL) energy of monolayer tungsten disulfide (WS2) by means of strain. We apply a local uniaxial stress to WS2 by exploiting electron-beam patterned and actuated polymeric micrometric artificial muscles (MAMs), which we implement onto monolithic synthetic WS2/graphene heterostructures. We show that MAMs are able to induce an in-plane stress to the top WS2 l…