期刊
ADVANCED MATERIALS
卷 34, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202201303
关键词
all-organic photodetectors; all-solution processing method; biosignal detection; dual-polarity output
类别
资金
- National Key R&D Program of China [2017YFA0204600]
- Inner Mongolia Talent Fund
- National Natural Science Foundation of China [12061131009, 51872050]
- Science and Technology Commission of Shanghai Municipality [21520712600, 19520744300]
This study presents an ultraflexible all-organic photodetector with high responsivity and stable performance, capable of outputting steady biosignals in specific applications. By introducing symmetrical organic electrodes, this photodetector exhibits dual-polarity photocurrent when flipped or folded.
Endowing photodetectors with mechanically flexibility and actual functionality are current research issues in developing optoelectronic devices. However, rigid metal-based or metal-oxide-based electrodes remain a block to the realization of ultraflexible electronics. Thus, an ultraflexible all-organic photodetector (all-OPD) is designed by innovatively introducing symmetrical organic electrodes PH1000/PH1000 to substitute the widely applied indium-doped tin oxide (ITO)/Ag electrodes. Specifically, this all-OPD exhibits a high self-powered responsivity (R) of over 100 mA W-1 among 500-600 nm and the photocurrent remains about 80% of the original performance after being bent 20 000 circles, and can output steady biosignals for photo-plethysmography (PPG) application. More importantly, this all-OPD outputs dual-polarity photocurrent as it is flipped or folded. Benefitting from the ordered phase distribution and designed Schottky barrier heights, the photogenerated holes will be transferred and collected by nearer electrode, while electrons will be trapped in the thick bulk heterojunction (BHJ) as a result of the long channel. This work offers a new avenue toward developing a multifunctional and ultraflexible all-OPD with a straightforward all-solution method, and it is expected to be more compatible in complex application scenarios.
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