Fullerene-Free Organic Solar Cells with an Efficiency of 10.2% and an Energy Loss of 0.59 eV Based on a Thieno[3,4-c]Pyrrole-4,6-dione-Containing Wide Band Gap Polymer Donor

Abstract

Although the combination of wide band gap polymer donors and narrow band gap small-molecule acceptors achieved state-of-the-art performance as bulk heterojunction (BHJ) active layers for organic solar cells, there have been only several of the wide band gap polymers that actually realized high-efficiency devices over >10%. Herein, we developed high-efficiency, low-energy-loss fullerene-free organic solar cells using a weakly crystalline wide band gap polymer donor, PBDTTPD-HT, and a nonfullerene small-molecule acceptor, ITIC. The excessive intermolecular stacking of ITIC is efficiently suppressed by the miscibility with PBDTTPD-HT, which led to a well-balanced nanomorphology in the PBDTTPD-HT/ITIC BHJ active films. The favorable optical, electronic, and energetic properties of PBDTTPD-HT with respect to ITIC achieved panchromatic photon-to-current conversion with a remarkably low energy loss (0.59 eV).

9,9′‐Bifluorenylidene‐Core Perylene Diimide Acceptors for As‐Cast Non‐Fullerene Organic Solar Cells: The Isomeric Effect on Optoelectronic Properties

“…[17] As shown in Ta bles S1 and S2 in the Supporting Information, the OPV devices with m-PIB as an acceptorw ith DIO or CN exhibit inferior performance with decreased J sc .T he PCEs of OSCs based on m-PIB with additives are slightly enhanced (3.95 %) after TA at 100 8Cf or 10 min, but still lower than those of the devicesw ithouta ny treatments. However,t he results were contrary to most cases reported in the literature.…”

“…However,t he results were contrary to most cases reported in the literature. [17] As shown in Ta bles S1 and S2 in the Supporting Information, the OPV devices with m-PIB as an acceptorw ith DIO or CN exhibit inferior performance with decreased J sc .T he PCEs of OSCs based on m-PIB with additives are slightly enhanced (3.95 %) after TA at 100 8Cf or 10 min, but still lower than those of the devicesw ithouta ny treatments. The device based on PTB7-Th:p-PIB hasv alues of PCE = 5.06 %, with a V oc = 0.82 V, and J sc = 10.82 mA cm À2 under the same [eV]…”

Electronic states and molecular orientation of ITIC film

“…, is at most ±0.10 eV. The IP of 5.75±0.10 eV for our film samples is some different from that (5.48-5.67 eV) [4,[11][12][13][14][15][16] measured by cyclic voltammetry. Our result is more practical since ITIC behaves as solid state in OSCs.…”

Molecular Engineering in Hole Transport π‐Conjugated Polymers to Enable High Efficiency Colloidal Quantum Dot Solar Cells

“…The chemical structures of EHT‐BDT and EHO‐BDT based π‐CP‐HTMs (PBDTTPD‐HT, PTB7‐Th, and PTB7) are shown in Figure b. The π‐CP‐HTMs were synthesized according to the procedures in the literature, with slight modification . While the EHT‐BDT was used as the D unit, two different electron deficient moieties (T34bT, TPD) were employed as the A units.…”

“…The π-CP-HTMs were synthesized according to the procedures in the literature, with slight modification. [33,34] While the EHT-BDT was used as the D unit, two different electron deficient moieties (T34bT, TPD) were employed as the A units. For comparison, an EHO-BDT based counterpart PTB7 was also synthesized.…”