A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss

Kan, Bin; Feng, Huanran; Yao, Huifeng; Chang, Meijia; Wan, Xiangjian; Li, Chenxi; Hou, Jianhui; Chen, Yongsheng

doi:10.1007/s11426-018-9334-9

Cited by 215 publications

(131 citation statements)

References 42 publications

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“…During the recent years,the field of non-fullerene-acceptor-based organic solar cells has undergone unprecedented progress and new efficiency records were frequently set (as illustrated in Figure 1). Nowadays,t he PCEs of singlejunction polymer donor:non-fullerene-acceptor solar cells have reached beyond 14 %, [13][14][15] outperforming the highest PCE (11.7 %) [16] of fullerene organic solar cells.Inaddition to innovations in non-fullerene acceptor materials,the development of polymer donor materials is one of the major driving forces to elevate PCEs of non-fullerene organic solar cells.A st he donor and acceptor components in bulk-heterojunction system both determine photovoltaic performances of corresponding organic solar cells,t he selection of appropriate electron donors to match non-fullerene acceptors is crucially important in achieving highly efficient non-fullerene organic solar cells.I nt his regard, the vast number of polymer donors that have been originally developed for matching with fullerenes offer abundant choices for immediate use in non-fullerene organic solar cells.E ncouragingly,s ome polymers have already been successfully applied in non-fullerene systems, such as PTB7-Th, [17] PBDB-T, [18] and J51. [19] Despite this,such polymers may not be the optimal donors for non-fullerene acceptor materials.A ccordingly,t here have been some attempts in developing novel polymer donors optimized specifically for non-fullerene acceptors,w hich indeed exhibited significant potential for constructing high-performance non-fullerene acceptor organic solar cells.…”

Section: Introductionmentioning

confidence: 99%

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

2019

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Over the past three years, non-fullerene (NF) organic solar cells (OSCs) have been a focus of research and their power conversion efficiencies have been improved dramatically from ~6% to over 14%. In addition to innovations in NF acceptors, the ongoing development of polymer donors has contributed significantly to the rapid progress of NF OSC performance. This review highlights the polymer donors that enable high-performance NF OSCs. We first review the impressive photovoltaic devices results achieved by some of important classes of conjugated polymer systems in NF OSCs. Then, we discuss molecular design strategies as far as developing matching polymer donors for NF acceptors. Finally, we conclude with a brief summary and outlook for advances in donor polymers to fulfill future commercialization.

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Section: Introductionmentioning

confidence: 99%

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

2019

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“…The photovoltaic performance of OSCs especially NF‐PSCs has underwent a rapid development along with the emergence of the indacenodithieno[3,2‐b]thiophene (IDTT) style non‐fullerene small molecule acceptor (NF‐SMA) possessing narrow bandgap . With the modification on the backbone, side chains and end groups of IDTT‐based NF‐SMA, the power conversion efficiency (PCE) of single junction NF‐PSCs has exceeded 13% …”

Section: Introductionmentioning

confidence: 99%

Efficient Polymer Solar Cells With High Fill Factor Enabled by A Furo[3,4‐c]pyrrole‐4,6‐dione‐Based Copolymer

et al. 2019

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Non‐fullerene polymer solar cells (NF‐PSCs) have achieved tremendous progress in power conversion efficiency (PCE), which is mainly attributed to the well absorption complementation and the admirable energy‐level alignment between donor polymers and fullerene‐free acceptors. However, the development of efficient donor polymers pairing with fullerene‐free acceptors relatively lags behind that of fullerene‐free acceptors in terms of number and diversity for fabricating NF‐PSCs. In this work, a two‐dimensional medium bandgap copolymer (PBDFFPD) based on benzo[1,2‐b:3,4‐b′]difuran (BDF) and furo[3,4‐c]pyrrole‐4,6‐dione (FPD), is firstly designed and synthesized. The as‐prepared polymer possesses a large conjugated plane with negligible torsion, strong intermolecular and intramolecular interaction, and deep highest occupied molecular orbital (HOMO) energy level. The optimized photovoltaic device based on PBDFFPD:ITIC wins a remarkable PCE of 9.58% with a large FF of 70.1%, the highest values ever reported for FPD‐based polymers. In addition, the statistical data from different batches of devices shows that PSCs based on PBDFFPD:ITIC at optimized conditions depict an excellent reproducibility of PCE with a deviation of 2.29%. The results demonstrate that PBDFFPD possesses great potential for constructing highly efficient NF‐PSCs.

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“…[ 51 ] As to form the complementary absorption, NCBDT‐4Cl, a narrow bandgap acceptor with intense absorption in near‐infrared (NIR) region and appropriate energy level alignment was selected as another acceptor to construct ternary PSCs. [ 52 ] Impressively, the P1 ternary PSC delivered a high PCE of 13.06%, which is 30% higher than the P1 binary devices. The greatly improved device performance could be mainly attributed to the broadened photoresponse, good compatibility of components, enhanced crystallinity and optimized charge transport.…”

Section: Introductionmentioning

confidence: 99%

Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Jiang

Wang

et al. 2020

Advanced Science

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Ternary strategy is a promising approach to broaden the photoresponse of polymer solar cells (PSCs) by adopting combinatory photoactive blends. However, it could lead to a more complicated situation in manipulating the bulk morphology. Achieving an ideal morphology that enhances the charge transport and light absorption simultaneously is an essential avenue to promote the device performance. Herein, two polymers with different lengths of side groups (P1 is based on phenyl side group and P2 is based on biphenyl side group) are adopted in the dual‐acceptor ternary systems to evaluate the relationship between conjugated side group and crystalline behavior in the ternary system. The P1 ternary system delivers a greatly improved power conversion efficiency (PCE) of 13.06%, which could be attributed to the intense and broad photoresponse and improved charge transport originating from the improved crystallinity. Inversely, the P2 ternary device only exhibits a poor PCE of 8.97%, where the decreased device performance could mainly be ascribed to the disturbed molecular stacking of the components originating from the overlong conjugated side group. The results demonstrate a conjugated side group could greatly determine the device performance by tuning the crystallinity of components in ternary systems.

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A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss

Cited by 215 publications

References 42 publications

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

Efficient Polymer Solar Cells With High Fill Factor Enabled by A Furo[3,4‐c]pyrrole‐4,6‐dione‐Based Copolymer

Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

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