Abstract
Introduction of thiazole into the conjugated backbone of semiconducting polymers is a useful strategy to enhance the open-circuit voltage of polymer solar cells.
Highlights
The resulting Polymer solar cells (PSCs), and improves the stability of the polymers against oxygen and moisture. These results prove that the substitution of thiazole into the conjugated backbone is an effective method for adjusting energy levels in organic photovoltaic materials
The low Jsc and external quantum efficiency (EQE) are a consequence of a diminished polymer/fullerene interface for charge generation, while the relative high fill factor (FF) can be a consequence of high domain purity that we infer from the high contrast between the light and dark regions in the transmission electron microscopy (TEM) of the BDT-DTzBT:[70]PCBM blend (Fig. 4b)
The results show that the replacement of thiophene by thiazole can effectively downshift the frontier orbital levels of the polymers without significantly changing the optical bandgap
Summary
Polymer solar cells (PSCs) are an emerging renewable energy technology that has the prospect of achieving efficient, largearea, flexible photovoltaic modules via roll-to-roll processing or ink-jet printing.1,2 The core component of a PSC is its bulkheterojunction (BHJ) active layer, which typically consists of a semiconducting polymer as the electron donor and a fullerene derivative as the electron acceptor.3 Tremendous progress has been achieved in the past few years with power conversion efficiencies (PCEs) exceeding 11% in both single- and multi-junction cells.4–6 These achievements strongly benefited from the development of new semiconducting conjugated polymers.7–9 By employing alternating donor–acceptor (D–A) units in the polymer backbone, creating new building blocks, incorporating proper peripheral functionalities, and optimizing alkyl side chain patterns, the electronic structures, energy levels, optical properties, and aggregation behaviour of conjugated polymers can be well controlled and rationally designed.10–14 Recently, wide bandgap conjugated polymers. The performance of the thiazole-containing polymers in solar cells is currently restricted by the relatively low molecular weight, which results in a sub-optimal bulk heterojunction morphology.
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