Abstract
A new wide band gap polymer PIDT-AQx with indacenodithiophene (IDT) as the electron-rich unit and acenaphthoquinoxaline (AQx) as the electron-deficient unit has been designed and synthesized. The optical band gap of PIDT-AQx was 1.81 eV with a HOMO energy level of −5.13 eV. Polymer solar cells with the blend of PIDT-AQx/PC71BM as the active layer achieved a power conversion efficiency (PCE) of 4.56%, with an open-circuit voltage (Voc) of 0.84 V, a current density (Jsc) of 9.88 mA cm−2, and a fill factor (FF) of 55% without any solvent additives and pre- or post-treatments. The photovoltaic performance of PIDT-AQx could be slightly improved with a PCE up to 4.78% after thermal annealing due to enhanced Jsc. The results indicate that acenaphthoquinoxaline is a promising building block for developing conjugated polymers for efficient solar cells application.
Highlights
Conjugated polymer solar cells (PSCs), with advantages such as low cost, light weight, flexibility, and roll-to-roll printing technology, have been intensely investigated as one of the potential renewable energy sources in recent years [1,2,3,4,5,6,7,8,9,10,11,12]
We found that the pristine and/or adding the solvent additive is of high importance to enhance the device performance [53,54,55]; PIDT-AQx/PC71BM film-based device achieved a promising power conversion efficiency (PCE) of 4.56% with an open-circuit these methods will raise the difficulty in device engineering and are negative for large-area voltage (Voc) of 0.84 V, a current density (Jsc) of 9.88 mA cm−2, and a fill factor (FF) of 55% (Table 2)
We found that the pristine PIDT-AQx/PC71 BM film-based external quantum efficiency (EQE) spectra of the PIDT-AQx/PC71BM device with thermal annealing device achieved a promising PCE of 4.56% with an open-circuit voltage (V oc ) of 0.84 V, a current was measured
Summary
Conjugated polymer solar cells (PSCs), with advantages such as low cost, light weight, flexibility, and roll-to-roll printing technology, have been intensely investigated as one of the potential renewable energy sources in recent years [1,2,3,4,5,6,7,8,9,10,11,12]. The morphological optimization of the active layer in PSCs plays a key role to improve the photovoltaic performance by facilitating the charge generation, separation, and transport within the device [29,30,31,32]. Various methods such as thermal annealing, solvent annealing, and adding additives have been used to control the morphology to achieve favorable phase separation. These methods will raise the difficulty in device engineering and are negative for large-area production
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