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Sree, Vijaya Gopalan
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article
The Impact of Sequential Fluorination of Pi-Conjugated Polymers on Charge Generation in All-Polymer Solar Cells
Abstract
<p>The performance of all-polymer solar cells (all-PSCs) is often limited by the poor exciton dissociation process. Here, the design of a series of polymer donors (P1–P3) with different numbers of fluorine atoms on their backbone is presented and the influence of fluorination on charge generation in all-PSCs is investigated. Sequential fluorination of the polymer backbones increases the dipole moment difference between the ground and excited states (Δµ<sub>ge</sub>) from P1 (18.40 D) to P2 (25.11 D) and to P3 (28.47 D). The large Δµ<sub>ge</sub> of P3 leads to efficient exciton dissociation with greatly suppressed charge recombination in P3-based all-PSCs. Additionally, the fluorination lowers the highest occupied molecular orbital energy level of P3 and P2, leading to higher open-circuit voltage (V<sub>OC</sub>). The power conversion efficiency of the P3-based all-PSCs (6.42%) outperforms those of the P2 and P1 (5.00% and 2.65%)-based devices. The reduced charge recombination and the enhanced polymer exciton lifetime in P3-based all-PSCs are confirmed by the measurements of light-intensity dependent short-circuit current density (J<sub>SC</sub>) and V<sub>OC</sub>, and time-resolved photoluminescence. The results provide reciprocal understanding of the charge generation process associated with Δµ<sub>ge</sub> in all-PSCs and suggest an effective strategy for designing π-conjugated polymers for high performance all-PSCs.</p>