Asymmetric Glycolated Substitution for Enhanced Permittivity and Ecocompatibility of High-Performance Photovoltaic Electron Acceptor

The past three years have witnessed the power conversion efficiency (PCE) of organic solar cells (OSCs) rocketing to over 18%, due to outstanding advantages of non‐fullerene acceptors (NFAs). However, large exciton binding energy (E b) caused by strong Coulombic force is still one of the main limiting factors for high‐performance OSCs. Thus, it is critical to reduce the E b for further enhancement of device performance. Many strategies have been developed to reduce the E b of organic materials previously. In this perspective, the calculation methods for E b and the relationship between E b and voltage loss (V loss) are discussed. Then, the effects of the properties of small‐molecule acceptors on E b from the perspectives of fused‐ring donor cores, end groups, side chains, and molecular packing are discussed. Finally, the potential directions for reducing E b and pointing out the trade‐off between E b and bandgaps/miscibility are put forward. It is hoped that this perspective could provide a new thinking of a molecular design for the breakthrough of OSCs.

show abstract

Section: Effect Of the Structure Of Nfas On E B Of Excitonsmentioning

confidence: 99%

Exciton Binding Energy of Non‐Fullerene Electron Acceptors

Zhu

Zhao

Wang

et al. 2022

Adv Energy and Sustain Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…where C represents capacitance, ϵ 0 represents vacuum dielectric constant ( ϵ 0 ≈8.854×10 −12 F m −1 ), L represents film thickness, and S represents film area. We assume that under the test frequency of 1 kHz [39] . The ϵ of the active layer film without PVDF is calculated to be 2.45.…”

Section: Resultsmentioning

confidence: 99%

Ferroelectric Polymer Drives Performance Enhancement of Non‐fullerene Organic Solar Cells

Deng

Huang

et al. 2022

Angewandte Chemie

View full text Add to dashboard Cite

Enhancing the built‐in electric field to promote charge dynamitic process is of great significance to boost the performance of the non‐fullerene organic solar cells (OSCs), which has rarely been concerned. In this work, we introduced a cheap ferroelectric polymer as an additive into the active layers of non‐fullerene OSCs to improve the device performance. An additional and permanent electrical field was produced by the polarization of the ferroelectric dipoles, which can substantially enhance the built‐in electric field. The promoted exciton separation, significantly accelerated charge transport, reduced the charge recombination, as well as the optimized film morphology were observed in the device, leading to a significantly improved performance of the PVDF‐modified OSCs with various active layers, such as PM6 : Y6, PM6 : BTP‐eC9, PM6 : IT‐4F and PTB7‐Th : Y6. Especially, a record efficiency of 17.72 % for PM6 : Y6‐based OSC and an outstanding efficiency of 18.17 % for PM6 : BTP‐eC9‐based OSC were achieved.

show abstract

“…We assume that under the test frequency of 1 kHz. [39] The ɛ of the active layer film without PVDF is calculated to be 2.45. With PVDF additive, the ɛ values of the films before and after poling are 3.10 and 3.72, respectively.…”

Section: Angewandte Chemiementioning

confidence: 99%

Ferroelectric Polymer Drives Performance Enhancement of Non‐fullerene Organic Solar Cells

Deng

Huang

et al. 2022

Angew Chem Int Ed

View full text Add to dashboard Cite

Enhancing the built-in electric field to promote charge dynamitic process is of great significance to boost the performance of the non-fullerene organic solar cells (OSCs), which has rarely been concerned. In this work, we introduced a cheap ferroelectric polymer as an additive into the active layers of non-fullerene OSCs to improve the device performance. An additional and permanent electrical field was produced by the polarization of the ferroelectric dipoles, which can substantially enhance the built-in electric field. The promoted exciton separation, significantly accelerated charge transport, reduced the charge recombination, as well as the optimized film morphology were observed in the device, leading to a significantly improved performance of the PVDF-modified OSCs with various active layers, such as PM6 : Y6, PM6 : BTP-eC9, PM6 : IT-4F and PTB7-Th : Y6. Especially, a record efficiency of 17.72 % for PM6 : Y6-based OSC and an outstanding efficiency of 18.17 % for PM6 : BTP-eC9-based OSC were achieved.

show abstract

Asymmetric Glycolated Substitution for Enhanced Permittivity and Ecocompatibility of High-Performance Photovoltaic Electron Acceptor

Cited by 53 publications

References 63 publications

Exciton Binding Energy of Non‐Fullerene Electron Acceptors

Exciton Binding Energy of Non‐Fullerene Electron Acceptors

Ferroelectric Polymer Drives Performance Enhancement of Non‐fullerene Organic Solar Cells

Ferroelectric Polymer Drives Performance Enhancement of Non‐fullerene Organic Solar Cells

Contact Info

Product

Resources

About