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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.55: Poster

Monday, March 12, 2018, 17:30–19:30, Poster B

Graphite Oxide Obtained From Bamboo as Possible Selective Contact For Solar CellsJhon Jairo Prias-Barragan1, •Katherine Gross1, Jose D Perea3, Nial Kilallea3, Wolfgang Heiss3, Christoph Brabec3, Hernando Ariza-Calderon1, and Pedro Prieto21IIs, Universidad del Quindío, Colombia — 2cenm, Department of Physics, Universidad del Valle, Colombia — 3i-MEET, FAU, Germany

The effect of the carbonization temperature (TCA) on the optoelectronic response of Graphene Oxide (GO) multilayers obtained from bamboo tar (BPA) was investigated. RAMAN, XRD and FTIR spectra indicate that increased TCA increases graphite conversion and reduces oxygen coverage. Decreased oxygen content from 17% to 4% tunes the Bandgap energy from 0.30 to 0.11 eV. Implicit solvation model COSMO was used to visualize the surface charge density; here we could observe that by increasing the oxygen content the electron acceptor and donor abilities increase in the material, showing the electron-hole pair density distributions by multifunctional oxide presence. The optoelectronic response investigated via UV-VIS, PL-Vis-NIR and PL-MIR measurements have shed light on the mechanism involved in light absorption processes. UV-VIS spectra show a broadband light absorption from 200 nm until 1100 nm. Interestingly, increasing TCA results in a blue-shift of the absorption. Broadening and blue-shift in the absorbance spectrum could be correlated with the large size distribution of the graphitic nano-crystals. This study suggests that GO-BPA can be appropriate as selective contact in OPV.

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