Enhanced Photovoltaic Performance of Low‐Bandgap Polymers with Deep LUMO Levels

Recent Advances in P-Type Conjugated Polymers for High-Performance Solar Cells

“…On the other hand, the Grazing Incidence Xray Scattering (GIXS) analysis showed that TPD-based polymers are able to maintain the face-on orientation of the polymer backbone and preserve a small π-stacking distance in the blend containing PC 71 BM. BDT-based polymer P46 incorporating thiadiazolo[3,4-c]pyridine (PyT) as the acceptor was reported by You et al [92]. P46 showed significant red-shifted absorption in the solid state than in solution state due to strong π-π stacking in the solid state.…”

Bulk Heterojunction Solar Cells — Opportunities and Challenges

“…The new building blocks have various electron withdrawing properties and hence are useful in tuning the properties of the polymer materials. The second strategy is to introduce substitutions on the BT unit, such as fluorine atoms [52][53][54][55][56][57][58][59][60], alkoxy groups [61][62][63][64][65], or replacement of C-H with imine nitrogen [66][67][68][69]. More building blocks can be prepared with the combination of these two strategies [70][71][72][73][74][75].…”

Incorporation of Thiadiazole Derivatives as π-Spacer to Construct Efficient Metal-Free Organic Dye Sensitizers for Dye-Sensitized Solar Cells: A Theoretical Study

“…Previous experiments have demonstrated that the optical absorption of the organic dyes is red-shifted on extension of the π conjugation by the incorporation of electron-deficient segments [22,24]. You and coworkers have synthesized a series of narrow band gap polymers incorporating NDT units for organic solar cells [29][30][31][32]. For example, recently they constructed a library of polymers employing the NDT and BT units as the weak donor and the strong acceptor, respectively.…”

“…A smaller HOMO-LUMO gap is needed to achieve a higher JSC, while the low HOMO energy level should still be maintained for efficient dye regeneration. You and coworkers have reported that the LUMO of donor-acceptor copolymers largely locates on the acceptor moiety, and the bandgap can be reduced by incorporating a electron deficient unit to lower the LUMO while at the same time maintain the HOMO energy level [29][30][31][32].…”