Neutron reflectometry and hard X-ray photoelectron spectroscopy study of the vertical segregation of PCBM in organic solar cells

The publication presents the results of investigations of the influence of dye dopant on the electrooptical and morphology properties of a polymeric donor:acceptor mixture. Ternary thin films (polymer:dye:fullerene) were investigated for potential application as an active layer in organic solar cells. The aim of the research is to determine the effect of selected dye materials (dye D131, dye D149, dye D205, dye D358) on the three-component layer and their potential usefulness as an additional donor in ternary cells, based on P3HT donor and PC71BM acceptor. UV–vis spectroscopy studies were performed, and absorption and luminescence spectra were determined. Ellipsometry parameters for single dye and ternary layers have been measured. The analyses were performed using the Raman spectroscopy method, and the Raman spectra of the mixtures and single components have been determined. Organic layers were prepared and studied using scanning electron microscope and atomic force microscope. For dyes, ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy studies were carried out and the ternary system was presented and analyzed in terms of energy bands.

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Investigation of Photo-carrier Generation Processes of Organic Solar Cells Using Time Resolved X-ray Photoelectron Spectroscopy

10.7567/ssdm.2016.f-2-03 ◽

2016 ◽

Author(s):

T. Sakurai ◽

K. Ozawa ◽

R. Yukawa ◽

K. Akimbo ◽

K. Takeuchi ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Photoelectron Spectroscopy ◽

Carrier Generation ◽

Time Resolved ◽

X Ray

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Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating

Nature Communications ◽

10.1038/s41467-021-25148-8 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Ying Zhang ◽

Kuan Liu ◽

Jiaming Huang ◽

Xinxin Xia ◽

Jiupeng Cao ◽

...

Keyword(s):

Solar Cells ◽

Phase Separation ◽

Organic Solar Cells ◽

Photoelectron Spectroscopy ◽

Bulk Heterojunction ◽

Depth Profiling ◽

Grazing Incidence ◽

X Ray Diffraction ◽

X Ray ◽

Xrd Techniques

AbstractGraded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated G-BHJ OSCs deliver an outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition and crystallinity gradient distributions, which benefit charge transport, and enable outstanding thick OSC PCEs (16.25% for 300 nm, 14.37% for 500 nm), which are among the highest reported. Moreover, the nonhalogenated solvent enabled G-BHJ OSC via open-air blade coating and achieved a record 16.77% PCE. The blade-coated G-BHJ has drastically different D-A crystallization kinetics, which suppresses the excessive aggregation induced unfavorable phase separation in BHJ. All these make G-BHJ a feasible and promising strategy towards highly efficient, eco- and manufacture friendly OSCs.

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