Abstract
A compatible low-bandgap donor polymer (poly[N-90-heptadecanyl-2,7carbazole-alt-3,6-bis(thiophen-5-yl)-2,5-dioctyl-2,5-dihydropyrrolo[3,4]pyrrole-1,4-dione], PCBTDPP) was judicially introduced into the archetypal poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) photoactive system to fabricate highly efficient ternary based bulk heterojunction polymer solar cells (PSCs). The PCBTDPP ternary-based PSC with optimal loading (0.2 wt.%) displayed outstanding performance with a champion power conversion efficiency (PCE) of 5.28% as compared to the PCE (4.67%) for P3HT:PC61BM-based PSC (reference). The improved PCE for PCBTDPP ternary-based PSC can be mainly attributed to the incorporation of PCBTDPP into P3HT:PC61BM that beneficially improved the optical, morphological, electronic, and photovoltaic (PV) performance. This work instills a rational strategy for identifying components (donor/acceptor (D/A) molecules) with complementary beneficial properties toward fabricating efficient ternary PSCs.
Highlights
Polymer solar cells (PSCs) have triggered stupendous attention owing to their cost-competitiveness, mechanical flexibility, lightweight nature, and compatibility for large area deposition [1,2,3,4,5,6,7]
The exciton generated in P3HT or PCBTDPP can be either dissociated at the D/A interfaces or directly transferred from P3HT to PCBTDPP via Forster resonance energy transfer (FRET) before dissociation [39]
The peak of P3HT PL intensity at ~552 nm was considerably quenched in P3HT:PCBTDPP(0.2 wt.%):PC61 BM as compared to P3HT:PC61 BM, suggesting an effective exciton dissociation in the fabricated ternary blend system [40]
Summary
Polymer solar cells (PSCs) have triggered stupendous attention owing to their cost-competitiveness, mechanical flexibility, lightweight nature, and compatibility for large area deposition [1,2,3,4,5,6,7]. To widen the light absorption capability of the P3HT:PC61 BM and to further improve photovoltaic (PV) performance, numerous strategies have been widely demonstrated, such as synthesizing new low-bandgap materials, employing tandem PSCs, doping suitable D/A molecules, etc. PCBTDPP has good compatibility and solubility in the photoactive blend, P3HT:PC61 BM (1,2-dichlorobenzene (DCB)), which is expected to influence the optoelectronic properties of the ternary-based PSC. To the best of our knowledge, the role and influence of PCBTDPP into P3HT:PC61 BM on the optical, structural, morphology and PV performance has not been studied in detail In this contribution, we clarify the relevant improvements on the optoelectronic properties, as well as their corresponding PV performance. The ternary PSC-based on optimal loading of PCBTDPP (0.2 wt.%) into P3HT: PC61 BM witnessed a high PCE of 5.28%, while the fabricated binary P3HT:PC61 BM-based PSC only displayed a PCE of 4.67%
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