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oe1(光电查) - 科学论文

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  • The rational and effective design of nonfullerene acceptors guided by a semi-empirical model for an organic solar cell with an efficiency over 15%

    摘要： Although much progress has been made for organic photovoltaics (OPVs), the active layer material design is generally based on a trial and error approach. It is still a challenge to rationally design active layer materials to further improve OPV performance. Herein, guided by a semi-empirical model we have proposed, two new small molecule acceptors, named F-2F and FO-2F, have been designed and synthesized based on an acceptor F-H. With difluoro substituted end group, F-2F shows red-shifted absorption than F-H, but still far from the range required in the semi-empirical model. Thus, with a subtle molecular optimization by inserting oxygen atom into the backbone of F-2F, FO-2F has been designed, which exhibits much red-shifted absorption, close to the preferred absorption range of the semi-empirical model. Blending with donor polymer PM6, OPV device based on FO-2F achieved an impressive PCE of 15.05% with a Voc of 0.878 V, a Jsc of 22.26 mA cm-2 and a notable FF of 0.77. Both the Voc and Jsc are among the predicted range of the model. These results render molecule FO-2F a new acceptor example which could demonstrates over 15% PCE only observed almost entirely for Y6 series.

    关键词： acceptor,semi-empirical model,nonfullerene,A-D-A,organic solar cell

    更新于2025-09-23 15:19:57

  • [IEEE 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) - Atlanta, GA, USA (2017.10.21-2017.10.28)] 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) - Detector response function of a HPGe detector to photon energies between 200 keV and 1.5 MeV for Gamma-ray nondestructive assay instrument

    摘要： A semi-empirical detector response function (DRF) model of HPGe detector was proposed to fit gamma-ray nondestructive assay transmission spectra. The model for each single peak contained a step function, a Gaussian function, and an exponential tail function. The Gaussian standard deviation obtained by electronic noise and Fano factor, so our DRF only had 4 parameters and they were obtained by the weighted nonlinear least-squares fitting method. In the application, 152Eu spectra were obtained by using the 30%, 50%, 70% HPGe detector, and fitted by the established DRF model. Reduced chi- square values were at the interval of 0.039-0.202. Its validity that the model had good versatility, can be applicable to different detection efficiency of HPGe detectors.

    关键词： gamma-ray nondestructive assay,HPGe detector,semi-empirical model,detector response function

    更新于2025-09-04 15:30:14