Organic photodetectors (OPDs) exhibit superior spectral responses but slower photoresponse times compared to inorganic counterparts. Herein, we study the light-intensity-dependent OPD photoresponse time with two small-molecule donors (planar MPTA or twisted NP-SA) co-evaporated with C acceptors. MPTA:C exhibits the fastest response time at high-light intensities (>0.5 mW/cm), attributed to its planar structure favoring strong intermolecular interactions. However, this blend exhibits the slowest response at low-light intensities, which is correlated with biphasic photocurrent transients indicative of the presence of a low density of deep trap states. Optical, structural, and energetical analyses indicate that MPTA molecular packing is strongly disrupted by C, resulting in a larger (370 meV) HOMO level shift. This results in greater energetic inhomogeneity including possible MPTA-C adduct formation, leading to deep trap states which limit the low-light photoresponse time. This work provides important insights into the small molecule design rules critical for low charge-trapping and high-speed OPD applications.
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http://dx.doi.org/10.1038/s41467-022-31367-4 | DOI Listing |
Nanoscale
December 2024
Department of Engineering and Materials Physics, Institute of Chemical Technology-Indian Oil Odisha Campus, Bhubaneswar, 751013, India.
In the present study, lanthanum oxytellurate (LOT) samples with varying La : Te ratios are successfully synthesized using a simple hydrothermal method that has enormous advantages. The prepared samples crystallize in a LaOTe composite phase with an orthorhombic crystal system. A nanorod-like morphology is observed for each sample, and the presence of constituent elements is verified from EDX results.
View Article and Find Full Text PDFSensors (Basel)
December 2024
College of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, China.
This study explores the fabrication of ZnO-SiO composite films on silicon substrates via a sol-gel method combined with spin-coating, followed by annealing at various temperatures. The research aims to enhance the UV emission and photoelectric properties of the films. XRD showed that the prepared ZnO sample has a hexagonal structure.
View Article and Find Full Text PDFAcc Chem Res
December 2024
Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80303, United States.
ConspectusSynthetic extracellular matrix (ECM) engineering is a highly interdisciplinary field integrating materials and polymer science and engineering, chemistry, cell biology, and medicine to develop innovative strategies to investigate and control cell-matrix interactions. Cellular microenvironments are complex and highly dynamic, changing in response to injury and disease. To capture some of these critical dynamics , biomaterial matrices have been developed with tailorable properties that can be modulated in the presence of cells.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, China.
Photoelectrochemical photodetectors (PEC PDs) are promising in underwater optoelectronic devices because of their low cost, good sensitivity, and self-powered characteristics. However, achieving high-performance omnidirectional visible PEC PDs using seawater as the electrolyte is still challenging, hindering their practical application. This work successfully synthesized CuO nanobelt arrays (NAs) on a linear copper wire via a low-temperature solution method with an annealing process.
View Article and Find Full Text PDFJ Phys Chem B
December 2024
Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russia.
The primary photoisomerization reactions of the all- to 13- and 11- to all- retinal protonated Schiff base (RPSB) in microbial and animal rhodopsins, respectively, occur on a subpicosecond time scale with high quantum yields. At the same time, the isolated RPSB exhibits slower excited-state decay, in particular, in its all- form, and hence the interaction with the protein environment is capable of changing the time scale as well as the specificity of the reaction. Here, by using the high-level QM/MM calculations, we provide a comparative study of the primary photoresponse of and RPSB isomers in both the initial forms and first photoproducts of microbial rhodopsin 2 (KR2) and bacteriorhodopsin (BR), and animal visual rhodopsin (Rho).
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