Monolithically self-assembled organic active materials integrated with thermoelectric for large spectrum solar harvesting system (Presentation Recording)

Tito L. Busani; Olga Lavrova; Matthew Erdman; Julio Martinez; Noel M. Dawson

doi:10.1117/12.2188897

5 October 2015 Monolithically self-assembled organic active materials integrated with thermoelectric for large spectrum solar harvesting system (Presentation Recording)

Tito L. Busani, Olga Lavrova, Matthew Erdman, Julio Martinez, Noel M. Dawson

Author Affiliations +

Proceedings Volume 9562, Next Generation Technologies for Solar Energy Conversion VI; 95620H (2015) https://doi.org/10.1117/12.2188897
Event: SPIE Optics + Photonics for Sustainable Energy, 2015, San Diego, California, United States

Abstract

We designed and studied a radial junction composed by a photovoltaic and thermoelectric array based on ZnO and CdTe nanowires surrounded by an absorbing organic self assembled in order to efficiently convert UV-visible and IR energy into electricity. The hot anode of n-type ZnO nanowires was fabricated using a thermal process on pre-seeded layer and results to be crystalline with a transmittance up to 92 % and a bandgap of ~ 3.32 eV. Conductivity measurements reveal diode-like behavior for the ZnO nanowires. The organic layer was deposited between the anode and cathode at room temperature The organic layer is composed of oppositely charged porphyrin metal (Zn(II) and Sn(IV)(OH)2) derivatives that are separately water soluble, but when combined form a virtually insoluble solid. The electron donor/acceptor properties (energy levels, band gaps) of the solid can be controlled by the choice of metals and the nature of the peripheral substituent groups of the porphyrin ring. A defect free sub nanometer deposition was achieved using a layer-by-layer deposition onto both ZnO and Bi2Te3 nanowires. The highly thermoelectric structure, which acts as a cold cathode, is composed of p-type Bi2Te3 nanowires with a thermoelectric efficiency (ZT) between ~0.7 to 1, values that are twice that expected for bulk Bi2Te3. Optoelectronic and structural properties shows that with 6 nm of organic layer it is possible to form a 3% efficient solar device with an enhanced thermo electric effected with a temperature gradient of 300 C.

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Tito L. Busani, Olga Lavrova, Matthew Erdman, Julio Martinez, and Noel M. Dawson "Monolithically self-assembled organic active materials integrated with thermoelectric for large spectrum solar harvesting system (Presentation Recording)", Proc. SPIE 9562, Next Generation Technologies for Solar Energy Conversion VI, 95620H (5 October 2015); https://doi.org/10.1117/12.2188897

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KEYWORDS

Nanowires

Thermoelectric materials

Zinc oxide

Solar energy

Metals

Solids

Crystals

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