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Naphthodithieno [3, 2-b] thiophene-based Copolymer as a Novel Third Component in Ternary Polymer Solar Cells with Simultaneously Enhanced Open Circuit Voltage, Short Circuit Current and Fill Factor

Abstract

Dialkoxyl-substituted naphthodithieno [3, 2-b] thiophene-based copolymer (PV12) was applied as a third component for ternary polymer solar cells (PSCs) based on PCDTBT1-x:PV12x:PC71BM. In Al-only ternary PSC with x=0.15, power conversion efficiency (PCE) of 6.73% was achieved due to simultaneous enhancement in open circuit voltage, short circuit current and fill factor, which is much higher than the PCE of 5.28% for Al-only binary PSCs based on PCDTBT:PC71BM and 2.93% for Al-only binary PSCs based on PV12:PC71BM. The PCE reached 7.69% when IIDTh-NSB as a cathode interlayer was introduced between the ternary active layer and Al. Ultraviolet photoemission spectroscopic measurements demonstrated the cascade-type energy level alignment at the ternary PCDTBT(D1)/PV12(D2)/PC71BM(A) junction. As a result, the voltage limitation was broken through at the D1/D2/A junction. Ultraviolet-visible absorption and external quantum efficiency spectra presented that PV12 had a complementary absorption of PCDTBT in the solar spectrum. Atomic force microscopic and transmission electron microscopic images showed that morphology and phase separation of the active layer was optimized by adding PV12. Photoluminescence spectra investigations suggested that Förster resonance energy transfer from PCDTBT to PV12 happened in the ternary PSCs under illumination. Finally the PCEs of the ternary PSCs are not so sensitive to the thickness of active layer as the ones of the binary PSCs, which is important for roll-to-roll coating processing of organic photovoltaic modules.

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Supplementary files

Publication details

The article was received on 18 Jan 2018, accepted on 15 Feb 2018 and first published on 15 Feb 2018


Article type: Paper
DOI: 10.1039/C8NJ00307F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Naphthodithieno [3, 2-b] thiophene-based Copolymer as a Novel Third Component in Ternary Polymer Solar Cells with Simultaneously Enhanced Open Circuit Voltage, Short Circuit Current and Fill Factor

    Y. Sun, B. Guo, Y. Chen, W. Zhang, X. Li, G. Yu and F. Li, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00307F

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