Compositional Dependence of the Open-Circuit Voltage in Ternary Blend Bulk Heterojunction Solar Cells Based on Two Donor Polymers.
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| Title: | Compositional Dependence of the Open-Circuit Voltage in Ternary Blend Bulk Heterojunction Solar Cells Based on Two Donor Polymers. |
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| Authors: | Khlyabich, Petr P.1, Burkhart, Beate1, Thompson, Barry C.1 barrycth@usc.edu |
| Source: | Journal of the American Chemical Society. 6/6/2012, Vol. 134 Issue 22, p9074-9077. 4p. |
| Subjects: | Heterojunctions, Solar cells, Electron donor-acceptor complexes, Polymers, Photovoltaic cells |
| Abstract: | Ternary blend bulk heterojunction (BHJ) solar cells containing as donor polymers two P3HT analogues, high-band-gap poly(3-hexylthiophene-co-3-(2- ethylhexyl)thiophene) (P3HT75-co-EHT25) and low-band- gap poly(3-hexylthiophene-thiophene-diketopyrrolopyr- role) (P3HTT-DPP-10%), with phenyl-C61-butyric acid methyl ester (PC61BM) as an acceptor were studied. When the ratio of the three components was varied, the open- circuit voltage (Voc) increased as the amount of P3HT75- co-EHT25 increased. The dependence of Voc on the polymer composition for the ternary blend regime was linear when the overall polymer:fullerene ratio was optimized for each polymer:polymer ratio. Also, the short-circuit current densities (Jsc) for the ternary blends were bettter than those of the binary blends because of complementary polymer absorption, as verified using external quantum efficiency measurements. High fill factors (FF) (>0.59) were achieved in all cases and are attributed to high charge-carrier mobilities in the ternary blends. As a result of the intermediate Voc, increased Jsc and high FF, the ternary blend BHJ solar cells showed power conversion efficiencies of up to 5.5 1%, exceeding those of the corresponding binary blends (3.16 and 5.07%). Importantly, this work shows that upon optimization of the overall polymer:fullerene ratio at each polymer:- polymer ratio, high FF, regular variations in Voc, and enhanced Jsc are possible throughout the ternary blend composition regime. This adds to the growing evidence that the use of ternary blends is a general and effective strategy for producing efficient organic photovoltaics manufactured in a single active-layer processing step. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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