Solution-Processed Organic Solar Cells with High Open-Circuit Voltage of 1.3 V and Low Non-Radiative Voltage Loss of 0.16 V.
basic_science · Level V
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- Record sourced from PubMed, PMID 32844465.
- Also identified by DOI 10.1002/adma.202002122.
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Abstract
Compared with inorganic or perovskite solar cells, the relatively large non-radiative recombination voltage losses (ΔV<sub>non-rad</sub> ) in organic solar cells (OSCs) limit the improvement of the open-circuit voltage (V<sub>oc</sub> ). Herein, OSCs are fabricated by adopting two pairs of D-π-A polymers (PBT1-C/PBT1-C-2Cl and PBDB-T/PBDB-T-2Cl) as electron donors and a wide-bandgap molecule BTA3 as the electron acceptor. In these blends, a charge-transfer state energy (E<sub>CT</sub> ) as high as 1.70-1.76 eV is achieved, leading to small energetic differences between the singlet excited states and charge-transfer states (ΔE<sub>CT</sub> ≈ 0.1 eV). In addition, after introducing chlorine atoms into the π-bridge or the side chain of benzodithiophene (BDT) unit, electroluminescence external quantum efficiencies as high as 1.9 × 10<sup>-3</sup> and 1.0 × 10<sup>-3</sup> are realized in OSCs based on PBTI-C-2Cl and PBDB-T-2Cl, respectively. Their corresponding ΔV<sub>non-rad</sub> are 0.16 and 0.17 V, which are lower than those of OSCs based on the analog polymers without a chlorine atom (0.21 and 0.24 V for PBT1-C and PBDB-T, respectively), resulting in high V<sub>oc</sub> of 1.3 V. The ΔV<sub>non-rad</sub> of 0.16 V and V<sub>oc</sub> of 1.3 V achieved in PBT1-C-2Cl:BTA3 OSCs are thought to represent the best values for solution-processed OSCs reported in the literature so far.