Author(s): Wang, TY (Wang, Tianyu); Zhao, K (Zhao, Kai); Wang, P (Wang, Pan); Shen, WF (Shen, Wanfu); Gao, HK (Gao, Haikuo); Qin, ZS (Qin, Zhengsheng); Wang, YS (Wang, Yongshuai); Li, CL (Li, Chunlei); Deng, HX (Deng, Huixiong); Hu, CG (Hu, Chunguang); Jiang, L (Jiang, Lang); Dong, HL (Dong, Huanli); Wei, ZM (Wei, Zhongming); Li, LQ (Li, Liqiang); Hu, WP (Hu, Wenping)

Source: ADVANCED MATERIALS Article Number: 2105665 DOI: 10.1002/adma.202105665 Early Access Date: OCT 2021

Abstract: The ability to detect light in photodetectors is central to practical optoelectronic applications, which has been demonstrated in inorganic semiconductor devices. However, so far, the study of polarization-sensitive organic photodetectors, which have unique applications in flexible and wearable electronics, has not received much attention. Herein, the construction of polarization-sensitive photodetectors based on the single crystals of a superior optoelectronic organic semiconductor, 2,6-diphenyl anthracene (DPA), is demonstrated. The systematic characterization of two-dimensionally grown DPA crystals with various techniques definitely show their strong anisotropy in molecular vibration, optical reflectance and optical absorption. In terms of polarization sensitivity, DPA-crystal based photodetectors exhibit a linear dichroic ratio up to approximate to 1.9. Theoretical calculations confirm that intrinsic linear dichroism, originated from the anisotropic in-plane crystal structure, is responsible for the polarization sensitivity of DPA crystals. This work opens up a new door for exploiting organic semiconductors for developing highly compact polarization photodetectors and providing new functionalities in novel flexible optical and optoelectronic applications.

Accession Number: WOS:000705015200001

PubMed ID: 34622516

ISSN: 0935-9648

eISSN: 1521-4095

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/adma.202105665