Efficacy assessment of metalloporphyrins as functional materials for photodetection applications: role of central tetrapyrrole metal ions

Abstract

Despite the continued research, it is still not entirely clear how important characteristics of metalloporphyrins are exploited for optoelectronic applications. Consequently, the stimulant aim for this work is to design and implement organic/inorganic heterojunctions based on metalloporphyrins (CuTPP, NiTPP, FeTPPCl, and MnTPPCl)/n-Si and evolve their photodetection performance. To evaluate the performance variation of variously manufactured photodetectors, structural characterizations using XRD, Raman spectroscopy, XPS, and AFM are combined with optical absorption and photoluminescence. Core level emissions are used to unveil the deposited films’ electronic and structural features. The estimated energy gap values are found to be 2.4, 2.53, 2.49, and 2.43 eV for CuTPP. NiTPP. FeTPPCl, and MnTPPCl, respectively. The fabricated devices’ PL-spectra are analyzed, where CuTPP exhibited the lowest value of excitonic binding energy. The photodetection performance is evaluated via the J–V relation under dark and various radiant illumination power. The microelectronic parameters of the manufactured heterojunctions are estimated. Ultimately, the photodetectors' figures of merit are estimated for all the fabricated devices, where CuTPP/n-Si heterojunction achieved the best performance and highest values of R = 11.95 mA/W, D* = 8.7 × 109 Jones, LDR = 46.18 dB, SNR = 203.4, and trise/tfall = 51.32/54.29 ms. Consequently, MTPP-based photoreceptors would play an active role as a powerful tool for light detection soon. Graphical abstract

Photoseeded Silver on Two-Dimensional Nanosheets of Cu-Porphyrin Metal–Organic Framework as a Tandem Electrocatalyst for Highly Efficient Electrochemical Reduction of CO2 to CH4

“…The O 1s XPS peaks at 530.9 and 532 eV (Figure S4B) suggests that the AgNP/Cu-TCPP MOF has both C and Cu-related oxygen, especially the oxygen of C=O, C–OH groups. The N 1s XPS scans (Figure S4C) suggest spectral features at ∼398.5 and ∼399.5 eV , corresponding to strong binding of nitrogen with carbon (C–N) and Cu (Cu–N) for protonated and nonprotonated nitrogen atoms of porphyrin. , Figure E depicting the high-resolution XPS scan of Ag 3d shows well-resolved strongly intense peaks at binding energies ∼366 and ∼372 eV corresponding to the Ag 3d 3/5 and Ag 3d 3/2 states of the silver incorporated into the Cu-TCPP MOF . The high-resolution Cu 2p XPS scans of the AgNP/Cu-TCPP MOF (Figure F) show peaks at binding energies ∼933.3 and 953 eV attributable to the Cu + 2p 3/2 and Cu 2+ 2p 1/2 states. ,, …”