Efficient ternary polymer solar cells via the enhanced charge transport approach using two donor polymers with identical valance bands

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Efficient ternary polymer solar cells via the enhanced charge transport approach using two donor polymers with identical valance bands
Author(s)
Jihoon Lee
Affiliation(s)
Department of Physics, Pukyong National University, Busan 48513, South Korea
KEYWORDS
Efficient ternary polymer solar cells, donor polymers, identical valance bands
ABSTRACT
Here, we demonstrate the preparation of efficient ternary polymer solar cells (PSCs) with high fill factor via the enhanced charge transport using two different electron donor polymers exhibit dissimilar absorption, but identical highest occupied molecular orbital (HOMO) energy levels and electron accepting [6,6]-phenyl C71 butyric acid methyl ester (PC70BM). We examined two different blend systems such as wide band gap–medium band gap and wide band gap–low band gap polymer combination. The wide band gap polymer (PBDT-DPPD) found to display its absorption band in between 300 nm to 600 nm, whereas the medium (RP1) and low band gap (PTB7-Th) polymers show their intense absorption in the range of 300-650 nm and 550-800 nm, respectively. Interestingly, all three polymers exhibit quite similar HOMO levels (–5.39 eV) but different lowest unoccupied molecular orbital (LUMO) levels. The ternary PSCs made from PBDT-DPPD (Eg~ 2.11 eV) and RP1 (Eg~ 1.91 eV) along with PC70BM offered a maximum power conversion efficiency (PCE) of 5.55% with an open-circuit voltage (Voc) of 0.91 V, a short-circuit current (Jsc) of 9.07 mA/cm2, and a fill factor (FF) of 0.68. Furthermore, the ternary PSCs made from PBDT-DPPD (Eg~ 2.11 eV) and PTB7-Th (Eg~ 1.68 eV) along with PC70BM gave a PCE of 10.42% with a Voc of 0.80 V, a Jsc of 17.61 mA/cm2, and a FF of 0.74. The Voc of ternary PSCs is found to be consistent with that of its corresponding binary PSCs. However, the notably an improved fill factor and photocurrent lead higher PCE for ternary PSCs compared to binary PSCs.