Surface doping effect on the optoelectronic performance of 2D organic crystals based on cyano-substituted perylene diimides

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外文摘要：Compared to organic thin films,organic single crystals offer significant potential in organic phototransis-tors(OPTs)due to their enhanced charge transport,large surface area,and defect-free nature.However,the development of n-type semiconductors has lagged behind p-type semiconductors.To enhance semi-conductor device performance,a doping process can be employed,which typically involves the introduc-tion of charged impurities into the crystalline semiconducting material.Its aim is to reduce the Ohmic losses,increase carrier density,improve transport capabilities,and facilitate effective carrier injection,ul-timately enhancing the electrical properties of the material.Traditional doping processes,however,often pose a risk of damaging the structure of single crystals.In this study,we have synthesized novel cyano-substituted chiral perylene diimides,which self-assemble into two-dimensional single crystals that can be used for n-type semiconductor devices.We have employed a surface doping strategy using diethy-lamine vapor without disrupting the crystal structure.The fabricated devices exhibit significantly higher charge transport properties after doping,achieving a maximum electron mobility of 0.14 cm2 V-1 s-1,rep-resenting an improvement of over threefold.Furthermore,the optoelectronic performance of the doped devices has significantly improved,with the external quantum efficiency increased by over 9 times and the significantly improved response time.These results suggest that our surface doping technology is a promising way for enhancing the performance of 2D organic single-crystal OPTs.

外文关键词：

Doping effectPhototransistorsPerylene diimidesOrganic crystalsCyano substitution

作者：

Jaeyong Ahn、Zhenping Li、Zhiwei Wang、Ke Gao、Huagui Zhuo、Wanuk Choi、Gang Chang、Xiaobo Shang、Joon Hak Oh

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作者单位：

School of Chemical and Biological Engineering,Institute of Chemical Processes,Seoul National University,Seoul 08826,South Korea

State Key Laboratory for Mechanical Behavior of Materials,Shaanxi International Research Center for Soft Matter,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China

Center for Ordered Nanoporous Materials Synthesis,School of Environmental Science and Engineering,Pohang University of Science and Technology,Gyeongbuk 37673,South Korea

Instrumental Analysis Center of Xi'an Jiaotong University,Xi'an 710049,China

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出版年：

2024

DOI：

10.1016/j.cclet.2024.109777

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(9)