2D In‐Plane Molecular Superlattice Heterojunctions for High‐Performance Ambipolar Electronics and Low‐Dose X‐Ray Sensing
Abstract
ABSTRACT Two‐dimensional in‐plane molecular superlattice heterojunctions, where distinct semiconducting components are integrated laterally within a single crystalline plane, offer an ideal architecture for controlling charge separation and transport in optoelectronic devices. However, realizing such structures with molecular‐level precision, long‐range periodicity, and sharp interfaces in organic semiconductors remains a major challenge. Here, the first 2D organic heterojunction featuring long‐range, in‐plane donor–acceptor superlattice via cocrystal engineering is presented. By employing phase‐separated molecular design for the donor (TIPS‐PEN) and acceptor (PDI‐FCN), strong in‐plane cohesion is decoupled from out‐of‐plane steric repulsion, inducing a periodic –D–A–D– arrangement within the crystal plane. The resulting high‐density, lattice‐defined heterointerfaces facilitate exciton dissociation, directional charge transport, and efficient extraction. The ultrathin crystal enables effective gate‐field control, yielding ambipolar OFETs with exceptional on/off ratios of 10 8 (holes) and 10 7 (electrons). Capitalizing on the narrow bandgap and the ordered 2D heterointerface, this material demonstrates outstanding high‐energy photon conversion efficiency. As an X‐ray detector, it exhibits high sensitivity of 4.21 × 10 4 µC Gy −1 cm −2 and low detection limit 5.73 nGy s −1 , enabling clear imaging at 14.77 nGy s −1 ultralow dose rate. This work provides new ideas for constructing 2D multicomponent organic heterostructures and unlocks potential for next‐generation flexible electronics and low‐dose radiation sensing.
Article Details
Authors (13)
Miaoyu Wang
The International Joint Institute of Tianjin University Tianjin University Fuzhou China
Shuyu Li
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest Agriculture and Forestry University
Lingjie Sun
State Key Laboratory of Advanced Materials for Intelligent Sensing, Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science & Institute of Molecular Aggregation Science, Tianjin University
Yiwen Ren
State Key Laboratory of Advanced Materials for Intelligent Sensing Key Laboratory of Organic Integrated Circuit Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry Institute of Molecular Aggregation Science & School of Science Tianjin University Tianjin China
Xianshuo Wu
Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University
Jiayuan Wang
Wenbin Shi
Zongbo Feng
State Key Laboratory of Advanced Materials for Intelligent Sensing Key Laboratory of Organic Integrated Circuit Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry Institute of Molecular Aggregation Science & School of Science Tianjin University Tianjin China
Shuaishuai Ding
State Key Laboratory of Advanced Materials for Intelligent Sensing, Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Institute of Molecular Aggregation Science, School of Science
Ran Ding
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering
Fangxu Yang
Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University
Xiaotao Zhang
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
Wenping Hu