Over 15% Efficiency in Ternary Organic Solar Cells by Enhanced Charge Transport and Reduced Energy Loss

Wang, Hongtao; Zhang, Zhuohan; Yu, Jiangsheng; Lin, Po‐Chen; Chueh, Chu‐Chen; Liu, Xin; Guang, Shun; Qu, Shenya; Tang, Weihua

doi:10.1021/acsami.0c03484

Cited by 26 publications

(16 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus the PBDB-T:MeIC1:Y16 ternary solar cell affords a PCE of 14.11% with an enhanced J SC of 22.76 mA cm −2 . [75] Besides the charge transfer and energy transfer mechanism, [76][77][78] the third component can also elevate the performance via morphology control, [79][80][81][82][83][84] which will be discussed in the next part of morphology control.…”

Section: Absorption Expansion For Enhanced Photon Utilizationmentioning

confidence: 99%

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Zhao

Zhang

et al. 2020

Advanced Energy Materials

151

117

View full text Add to dashboard Cite

the center, side-chains hanging out from the molecular plane, and two strong compact electron-withdrawing end groups. Independent modifications of these three parts provide diverse NFA molecular structures, thus enabling strong absorption in the visible and/or near infrared (NIR) regions, easily tunable energy levels, and finely tunable crystallinity. [28-32] In addition, low voltage losses are a significant feature of NFA OSCs compared to their fullerene counterparts, contributing to the rapidly increasing PCE. [33-36] At the same time, the operational stability of NFA OSCs has also been demonstrated to be promising, [37-41] although further improvement is required to meet the standard for practical applications. Along with the rapid development of materials and devices, the fundamental understanding of OSCs is also moving forward, though at a slower pace compared with that of material development and device engineering. One of the greatest impediments to developing a fundamental understanding of OSCs lies in the bulk heterojunction (BHJ) structure. The invention of BHJ, which is a milestone in OSC research, increases the interfacial area between the electron donor and electron acceptor materials, overcoming the issues of short exciton diffusion length, limited exciton lifetime, and charge separation that limits bilayer junctions. [42] Together with these advantages, the BHJ structure also presents challenges. The multiple phases and complex interfaces bring about sophisticated hierarchical morphologies and complicated charge dynamics, which are difficult for experimental observation and control. In NFA-based systems, some of these challenges have even been manifested. The similarity in the element constitution makes it difficult to spatially distinguish the electron donor and electron acceptor materials. Additionally, the resemblance of energy makes the spectra indistinguishable for charge-transfer (CT) states and singlet excitons. [33] Furthermore, OSC materials are updated so fast that the new materials can be distinct from previous ones, and the characteristics may be entirely different. This review covers emerging approaches for enhancing the efficiency and stability of non-fullerene OSCs. We highlight that recent advances on non-fullerene OSCs result from the coordinated development of donors and acceptors; those who are interested in a comprehensive understanding of donor materials are referred to recent review articles on this topic. [43-49] In this review, we mainly focus on the development of acceptors. We summarize new strategies for high short-circuit current (J SC) and fill factor (FF). A variety of methods, for example, extended absorption and effective morphology control, are discussed. We also introduce design rules for low energy losses, especially by The past three years have witnessed rapid growth in the field of organic solar cells (OSCs) based on non-fullerene acceptors (NFAs), with intensive efforts being devoted to material development, device engineering, and understanding of device physi...

show abstract

Section: Absorption Expansion For Enhanced Photon Utilizationmentioning

confidence: 99%

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Zhao

Zhang

et al. 2020

Advanced Energy Materials

151

117

View full text Add to dashboard Cite

show abstract

“…The energy loss (E loss ) in the PSCs is estimated from E loss = E gopt -qV OC , where E gopt is calculated from the onset of the EQE spectra of the devices. 75,76 The values of E loss are listed in Table 1. The E loss value for the ternary PSC is higher than that of P:Cz-IC and smaller than that of the P:PC 71 BM based devices, which is consistent with the values of V OC observed in the PSCs.…”

Section: Materials Device Fabrication and Characterizationmentioning

confidence: 99%

Efficient ternary bulk heterojunction organic solar cells using a low-cost nonfullerene acceptor

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The incorporation of FA into binary OPVs based on NFA can improve the electron mobility due to the outperformed electron mobility of FAs, further optimizing μ h /μ e and reducing recombination, consistent with a high FF. [75][76][77][78][79][80][81][82][83][84][85][86] Besides that, the exciton dissociation is also enhanced, to boost the photoinduced current via the enlarged D/A interface. The wide application of the ternary strategy in many different binary systems based on NFA can support that the use of FA as the third component can improve device efficiency.…”

Section: Mending Charge Dynamicsmentioning

confidence: 99%

High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-fullerene Acceptors

Jiang

Zhu

2021

Organic Materials

View full text Add to dashboard Cite

With the development of the non-fullerene acceptor (NFA), the use of ternary organic photovoltaic devices based on a fullerene acceptor and a NFA is now widespread, and the merits of both acceptor types can be fully utilized. However, the effective approach of enhancing device performance is adjusting the charge dynamics and the thin-film morphology of the active layer via introducing the second acceptor, which would significantly impact the open-circuit voltage, the short-circuit current, and the fill factor, thus strongly affecting device efficiency. The functions of the second acceptor in a ternary organic solar cell with a fullerene acceptor and a NFA are summarized here. These include a broader absorption spectrum; formation of a cascade energy level or energy transfer; modified thin-film morphology including phase separation, effects on crystallinity, size, and purity of domain; and vertical distribution along with improved charge dynamics like exciton dissociation and charge transport, collection, and recombination. Then, we discuss the hierarchical morphology in ternary solar cells may benefit device performance and the outlook of the ternary device.

show abstract

Over 15% Efficiency in Ternary Organic Solar Cells by Enhanced Charge Transport and Reduced Energy Loss

Cited by 26 publications

References 62 publications

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Efficient ternary bulk heterojunction organic solar cells using a low-cost nonfullerene acceptor

High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-fullerene Acceptors

Contact Info

Product

Resources

About