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Sub-5 nm single crystalline organic p-n heterojunctions.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Xiao, Mingchao 
Liu, Jie 
Han, Guangchao 
Shi, Yanjun 

Abstract

The cornerstones of emerging high-performance organic photovoltaic devices are bulk heterojunctions, which usually contain both structure disorders and bicontinuous interpenetrating grain boundaries with interfacial defects. This feature complicates fundamental understanding of their working mechanism. Highly-ordered crystalline organic p-n heterojunctions with well-defined interface and tailored layer thickness, are highly desirable to understand the nature of organic heterojunctions. However, direct growth of such a crystalline organic p-n heterojunction remains a huge challenge. In this work, we report a design rationale to fabricate monolayer molecular crystals based p-n heterojunctions. In an organic field-effect transistor configuration, we achieved a well-balanced ambipolar charge transport, comparable to single component monolayer molecular crystals devices, demonstrating the high-quality interface in the heterojunctions. In an organic solar cell device based on the p-n junction, we show the device exhibits gate-tunable open-circuit voltage up to 1.04 V, a record-high value in organic single crystalline photovoltaics.

Description

Keywords

Journal Title

Nature communications

Conference Name

Journal ISSN

2041-1723

Volume Title

12

Publisher

Sponsorship
Chinese Academy of Sciences (CAS) (the Strategic Priority Research Program (Grant No. XDB30000000), Hundred Talents Plan)
Ministry of Science and Technology of the People's Republic of China (Chinese Ministry of Science and Technology) (2016YFB0401100, 2017YFA0204704)
National Natural Science Foundation of China (National Science Foundation of China) (22075295, 21873108, 21805284)