Journal
ADVANCED MATERIALS
Volume 34, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202201364
Keywords
2D molecular crystals; negative photoresponse; organic phototransistors; p-n heterojunctions
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Funding
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China [2021ZZ129]
- National Natural Science Foundation of China [91833306, 51633006, 51903186]
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A novel 1D/2D molecular crystal p-n heterojunction has been developed to produce ultra-sensitive negative phototransistors (NPTs) with remarkable photoresponsivity and detectivity. These NPTs exhibit intriguing characteristics undiscovered in PPTs, opening up new possibilities for optoelectronic applications.
Anomalous negative phototransistors in which the channel current decreases under light illumination hold potential to generate novel and multifunctional optoelectronic applications. Although a variety of design strategies have been developed to construct such devices, NPTs still suffer from far lower device performance compared to well-developed positive phototransistors (PPTs). In this work, a novel 1D/2D molecular crystal p-n heterojunction, in which p-type 1D molecular crystal (1DMC) arrays are embedded into n-type 2D molecular crystals (2DMCs), is developed to produce ultrasensitive NPTs. The p-type 1DMC arrays act as light-absorbing layers to induce p-doping of n-type 2DMCs through charge transfer under illumination, resulting in ineffective gate control and significant negative photoresponses. As a result, the NPTs show remarkable performances in photoresponsivity (P) (1.9 x 10(8)) and detectivity (D*) (1.7 x 10(17) Jones), greatly outperforming previously reported NPTs, which are one of the highest values among all organic phototransistors. Moreover, the device exhibits intriguing characteristics undiscovered in PPTs, including precise control of the threshold voltage by controlling light signals and ultrasensitive detection of weak light. As a proof-of-concept, the NTPs are demonstrated as light encoders that can encrypt electrical signals by light. These findings represent a milestone for negative phototransistors, and pave the way for the development of future novel optoelectronic applications.
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