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Effect of Charge Recombination on the Fill Factor of Small Molecule Bulk Heterojunction Solar Cells

Advanced energy materials, 2011-07, Vol.1 (4), p.610-617 [Peer Reviewed Journal]

Copyright © 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim ;ISSN: 1614-6832 ;EISSN: 1614-6840 ;DOI: 10.1002/aenm.201100040

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Title:
Effect of Charge Recombination on the Fill Factor of Small Molecule Bulk Heterojunction Solar Cells
Author: Zhang, Yuan ; Dang, Xuan-Dung ; Kim, Chunki ; Nguyen, Thuc-Quyen
Subjects: Blended ; bulk heterojunction solar cells ; carrier density ; Charge ; charge recombination ; Energy conversion efficiency ; fill factor ; Illumination ; Impedance spectroscopy ; Photovoltaic cells ; Power loss ; solar (photovoltaic), solid state lighting, phonons, thermoelectric, bio-inspired, energy storage (including batteries and capacitors), electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing) ; Solar cells ; SOLAR ENERGY
Is Part Of: Advanced energy materials, 2011-07, Vol.1 (4), p.610-617
Description: Solution‐processed organic BHJ solar cells based on 3,6‐bis[5‐(benzofuran‐2‐yl)thiophen‐2‐yl]‐2,5‐bis(2‐ethylhexyl)pyrrolo[3,4‐c]pyrrole‐1,4‐dione (DPP(TBFu)2) or poly(3‐hexylthiophene) blended with [6,6]‐phenyl‐C60(70) ‐butyric acid methyl ester (PC60(70) BM) behave differently under various irradiation intensities. Small molecule‐based DPP(TBFu)2:PC60 BM solar cells show up to 5.2% power conversion efficiency and a high fill factor at low light intensity. At 100 mW cm−2 illumination, the efficiency and fill factor decrease, resulting in stronger power losses. Impedance spectroscopy at various light intensities reveals that high charge recombination is the cause of the low fill factor in DPP(TBFu)2:PC60 BM. Solution‐processed organic BHJ solar cells based on DPP(TBFu)2 and P3HT blended with PCBM behave differently under various irradiation intensities. Small molecule‐based solar cells show up to 5.2% power conversion efficiency and a high fill factor at low light intensity. At 100 mW cm−2 illumination, the efficiency and fill factor decrease, resulting in stronger power loss. Impedance spectroscopy at various light intensities reveals that high charge recombination is the cause of the low fill factor.
Publisher: Weinheim: WILEY-VCH Verlag
Language: English
Identifier: ISSN: 1614-6832
EISSN: 1614-6840
DOI: 10.1002/aenm.201100040
Source: Alma/SFX Local Collection

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Effect of Charge Recombination on the Fill Factor of Small Molecule Bulk Heterojunction Solar Cells

Copyright © 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim ;ISSN: 1614-6832 ;EISSN: 1614-6840 ;DOI: 10.1002/aenm.201100040

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