Molecular design of a non-fullerene acceptor enables a P3HT-based organic solar cell with 9.46% efficiency

Yang, Chenyi; Zhang, Shaoqing; Ren, Junzhen; Gao, Mengyuan; Bi, Pengqing; Ye, Long; Hou, Jianhui

doi:10.1039/d0ee01763a

Cited by 171 publications

(181 citation statements)

References 34 publications

Supporting

Mentioning

174

Contrasting

Order By: Relevance

“…[103] From the perspective of the acceptor, Hou and coworkers changed the end group of BTP-4Cl to reduce its miscibility with P3HT. [104] The enhanced χ of the system drives an appropriate phase separation, increasing the J SC and FF significantly. [104] In addition, the side chains of both donor and acceptor materials also affect the phase separation because the variation of solubility changes the χ parameter of the system.…”

Section: Morphology Controlmentioning

confidence: 99%

“…[104] The enhanced χ of the system drives an appropriate phase separation, increasing the J SC and FF significantly. [104] In addition, the side chains of both donor and acceptor materials also affect the phase separation because the variation of solubility changes the χ parameter of the system. [105,106] However, there are still open questions about the relationship between molecular structure and miscibility.…”

Section: Morphology Controlmentioning

confidence: 99%

See 1 more Smart Citation

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

Zhao

Zhang

et al. 2020

Advanced Energy Materials

139

116

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: Morphology Controlmentioning

confidence: 99%

Section: Morphology Controlmentioning

confidence: 99%

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

Zhao

Zhang

et al. 2020

Advanced Energy Materials

139

116

View full text Add to dashboard Cite

show abstract

“…Through molecular engineering along with finely manipulating the film morphology (which will be discussed below), at present, P3HT:nonfullerene blend systems have been boosted to 7-9%. [116][117][118][119][120][121] Obviously, the photovoltaic performance of P3HT:nonfullerene systems have outperformed the counterparts based on fullerene derivatives, owing to the reduced E loss and extended absorption of P3HT:nonfullerene blend films. Despite the great progress, the absorption of a majority of P3HT:nonfullerene systems were still limited within 800 nm, which impedes the further enhancement of the device efficiency.…”

Section: Design Of Nonfullerene Acceptors To Pair With P3htmentioning

confidence: 99%

Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Wang

Qin

et al. 2020

Advanced Energy Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…[ 1 ] As Heeger and co‐workers reported that the efficient charge separation results from a bicontinuous network of internal donor–acceptor heterojunctions, bulk heterojunction (BHJ) formed by an interpenetrating blend of low‐bandgap conjugate polymer and electron‐accepting fullerene derivatives constitutes a very promising development in the field to date. [ 2 ] Many approaches have been used to improve the organic device performance nearly 18% in power conversion efficiency (PCE), [ 3 ] such as the modified acceptor structure of fullerene‐based, [ 4–6 ] the innovations in optically active material design, [ 7 ] use of additive, [ 8 ] blend morphology control, [ 9,10 ] and cell architectures. [ 11 ] Intensive research of potential materials as future photovoltaic technologies has been conducted, [ 3–11 ] especially discusses about the mechanisms of carrier transportation.…”

Section: Introductionmentioning

confidence: 99%

“…[ 2 ] Many approaches have been used to improve the organic device performance nearly 18% in power conversion efficiency (PCE), [ 3 ] such as the modified acceptor structure of fullerene‐based, [ 4–6 ] the innovations in optically active material design, [ 7 ] use of additive, [ 8 ] blend morphology control, [ 9,10 ] and cell architectures. [ 11 ] Intensive research of potential materials as future photovoltaic technologies has been conducted, [ 3–11 ] especially discusses about the mechanisms of carrier transportation. [ 12–15 ] However, the performance improvements in all cases are strongly dependent on the electronic structure at an interface, which, in turn, is governed by many factors, such as energetic offset or energy barrier, induced by the electronic coupling of the materials and how the materials link to each other.…”

Section: Introductionmentioning

confidence: 99%

Energetic Alignment‐Related Effect on Carrier Extraction in Organic Photovoltaic Devices with Cathode Conducting Layer

Chang

Lin

Yang

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

The performance of organic photovoltaic (OPV) devices is strongly dependent on the electronic structure at the interface, including energetic offset induced by the electronic coupling of the materials and how the materials link to each other. Herein, the studies on modification of the interface of active layer and cathodes with insertion of carrier selective materials are reported. The thermalization of hot metal diffusion via X‐ray photoemission spectroscopy (XPS) as well as the energetic offset via ultraviolet photoemission spectroscopy (UPS) in situ is characterized. These investigations allow them to investigate the mechanisms at the interface and correlate these findings with the device performance, such as the correlation between interfacial energy band alignment and charge carrier transport, recombination, and extraction. Finally, the influence of cathode modification materials with various energetic offsets or transport behaviors on Voc and OPV performance parameters is investigated. With these studies, it is suggested that the incorporation of electrode modification materials with energetic favorable band alignment can achieve better photovoltaic performance.

show abstract

Molecular design of a non-fullerene acceptor enables a P3HT-based organic solar cell with 9.46% efficiency

Abstract: The advantage in low cost makes P3HT one of the most attractive electron donors for photovoltaic applications, but the power conversion efficiency (PCE) of the P3HT-based organic solar cells (OSCs)...

Cited by 171 publications

References 34 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

Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Energetic Alignment‐Related Effect on Carrier Extraction in Organic Photovoltaic Devices with Cathode Conducting Layer

Contact Info

Product

Resources

About