Journal ArticleDOI
Selenium-Containing Organic Photovoltaic Materials.
TLDR
In this paper, a selenium-substituted small-molecule acceptor (NFAs) was proposed to increase the short-circuit current density of organic photovoltaics.Abstract:
ConspectusOrganic photovoltaics (OPVs) with a photoactive layer containing a blend of organic donor and acceptor species are considered to be a promising technology for clean energy owing to their unique flexible form factor and good solution processability that can potentially address the scalability challenges. The delicate designs of both donors and acceptors have significantly enhanced the power conversion efficiency of OPVs to more than 18%. Nonfullerene small-molecule acceptors (NFAs) have played a critical role in enhancing the short-circuit current density (JSC) by efficiently harvesting near-infrared (NIR) sunlight. To take full advantage of the abundant NIR photons, the optical band gap of NFAs should be further reduced to improve the performance of OPVs. Incorporating highly polarizable selenium atoms onto the backbone of organic conjugated materials has been proven to be an effective way to decrease their optical band gap. For example, a selenium-substituted NFA recently developed by our group has attained a JSC of approximate 27.5 mA cm-2 in OPV devices, surpassing those of most emerging photovoltaic systems. Inspired by this advance, we concentrate on the topic of selenium-containing materials in this Account to incite readers' interest in further exploring this series of materials.In this Account, we first compare the differences among chalcogen heterocycles and discuss the influence of fundamental electronic behavior on the collective photoelectrical properties of the resulting materials. The superior features of selenium-substituted materials are summarized as follows: (1) The large covalent radius of selenium can diminish the π-orbital overlap, rendering enhanced quinoidal resonance character and a narrowed optical band gap of resulting materials. (2) The selenium atom is more polarizable than sulfur owing to its larger and looser outermost electron cloud, enabling enhanced intermolecular Se-Se interaction and increased charge carrier mobility of relevant materials in the solid state. We then focus on summarizing the design rules for various categories of selenium-containing materials including polymer donors, small-molecule acceptors, and polymer acceptors, especially those composed of ladder-type polycyclic units. The motivation for incorporating selenium atoms into these materials and the structure-property relationships were thoroughly elucidated. Specifically, we discuss the changes in the optical band gap, charge carrier mobility, and molecular packing induced by selenium substitution and correlate the effects of these changes with the exciton behaviors, energy loss, and nanoscale film morphology of corresponding OPV devices. Furthermore, we point out the intrinsic stability of selenium-containing materials under maximum-power-point tracking and long-term photo- or thermostress and indicate their potential use in semitransparent and tandem solar cells. At the end, the prospect of future research focuses and the possible applications of selenium-containing materials in the OPV field are discussed.read more
Citations
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Journal ArticleDOI
Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor
Wei Gao,Feng Xiao Qi,Zhengxing Peng,Francis Lin,Kui Guang Jiang,Cheng Zhong,Werner Kaminsky,Zhiqiang Guan,Chun-Sing Lee,Tobin J. Marks,Harald Ade,Alex K.-Y. Jen +11 more
TL;DR: In this paper , a record power conversion efficiency of over 19% was achieved in planar-mixed heterojunction (PMHJ) organic solar cells (OSCs) by adopting the asymmetric selenium substitution strategy in making a pseudosymmetric electron acceptor, BS3TSe•4F.
Journal ArticleDOI
Selenium: A Unique Member in the Chalcogen Family for Conjugated Materials Used in Perovskite and Organic Solar Cells
TL;DR: In this article , the design of the selenium-incorporated materials applied in the perovskite and organic solar cells (PVSCs and OSCs) to provide a systematic study on the relationship between chemical structures, material properties, and device performance is focused on.
Journal ArticleDOI
19.28% Efficiency and Stable Polymer Solar Cells Enabled by Introducing an NIR‐Absorbing Guest Acceptor
Qunping Fan,Ru-Zhang Ma,Zhaozhao Bi,Xunfan Liao,Baohua Wu,Sen Zhang,Wen yan Su,Jin Fang,Chao Zhao,Cenqi Yan,Kai Chen,Yuxiang Li,Chaoyang Gao,Gang Li,Wei Ma +14 more
TL;DR: In this article , a near-infrared (NIR) absorbing small-molecule acceptor (SMA) with strong intermolecular interaction and crystallinity is developed by combining selenophene-fused core with naphthalene-containing end-group, and then as a custom-tailor guest acceptor is incorporated into the binary PM6:L8•BO host system.
Journal ArticleDOI
Recent Progress in All-Small-Molecule Organic Solar Cells.
TL;DR: In this article , a review of small-molecule (SM) donors and non-fullerene acceptor (NFA) technologies for organic solar cells is presented.
Journal ArticleDOI
Enhancing Photon Utilization Efficiency for High‐Performance Organic Photovoltaic Cells via Regulating Phase‐Transition Kinetics
Pengqing Bi,Jianqiu Wang,Jian Zhang,Zhihao Chen,Jia-Wei Qiao,Jiangbo Dai,Shaoqing Zhang,Xiaotao Hao,Zhixiang Wei,Jianhui Hou +9 more
TL;DR: In this article , a multiscale fibril network morphology in a PBQx−TCl:PBDB−TF:eC9−2Cl-based system is constructed by regulating donor and acceptor phase transition kinetics.
References
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Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core
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Journal ArticleDOI
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Journal ArticleDOI
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