4.8 Article

Dual-Band, Efficient Self-Powered Organic Photodetectors with Isotype Subphthalocyanine-Based Heterojunctions toward Secure Optical Communications

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 37, Pages 42277-42288

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c09008

Keywords

n-type SubPc derivatives; SubPc-based heterojunctions; intramolecular charge transfer; energy level manipulation; dual-band OPD; low dark current

Funding

  1. National Natural Science Foundation of China [60906022, 21401138, 22003045]
  2. Natural Science Foundation of Tianjin [18JCYBJC86100]
  3. Scientific Developing Foundation of Tianjin Education Commission [2018ZD09]

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In this work, three new SubPc derivatives were designed and synthesized for use in high-performance OPDs. These derivatives exhibited improved intramolecular charge transfer, high electron mobilities, optimized energy levels, and good thermal stability. The SubPc heterojunctions showed a dual-band response and self powered effect, with the optimal OPD outperforming most reported SubPc-based OPDs. The better interfacial contact of the derivatives led to improved device performances.
High-performance heterojunction organic photo detectors (OPDs) are of great significance in optical detecting technology due to their tailorable optoelectronic properties. Herein, we designed and synthesized three n-type subphthalocyanine (SubPc) derivatives PhO-BSubPcF(12), CHO-PhO-BSubPcF(12), and NO2-PhO-BSubPcF(12) via axial nonhalogen substitution on fluorinated SubPc. These SubPc derivatives exhibit improved intramolecular charge transfer, high electron mobilities, optimized energy levels, and good thermal stability. The novel isotype p-n SubPc heterojunctions are evaluated as photosensitive layers in OPDs, which show a UV-visible dual-band response and self powered effect. The optimal OPD with Br-BSubPc/NO2-PhO-BSubPcF12 presents stable and superior performances with a high responsivity (R) of 0.14 A W-1, a peak external quantum efficiency (EQE) of 30.6%, and an extremely low dark current of 0.92 nA cm(-2) under a 570-595 nm illumination without a bias voltage. It has outperformed most of the reported SubPc-based OPDs. The better interfacial contact of p-n SubPc derivatives leads to a large depletion region with decreased trap densities as well as a low carrier recombination rate, which is conducive to the photoinduced carriers' separation and well-balanced transport, resulting in high device performances. Moreover, a secure communication strategy is successfully demonstrated by dual-band optimal OPD. This work is expected to provide some guidance for molecular engineering and device performance toward multifunctional electronics.

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