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Chlorination of dithienobenzodithiophene (DTBDT) based polymers to simultaneously improve the VOC, JSC and FF of non-fullerene organic solar cells
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-09-01 , DOI: 10.1039/d0se01176b Jialing Zhou 1, 2, 3, 4, 5 , Bao Zhang 1, 2, 3, 4, 5 , Wenjun Zou 1, 2, 3, 4, 5 , Ailing Tang 1, 2, 3, 4, 5 , Yanfang Geng 1, 2, 3, 4, 5 , Qingdao Zeng 1, 2, 3, 4, 5 , Qiang Guo 5, 6, 7, 8 , Erjun Zhou 1, 2, 3, 4, 5
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-09-01 , DOI: 10.1039/d0se01176b Jialing Zhou 1, 2, 3, 4, 5 , Bao Zhang 1, 2, 3, 4, 5 , Wenjun Zou 1, 2, 3, 4, 5 , Ailing Tang 1, 2, 3, 4, 5 , Yanfang Geng 1, 2, 3, 4, 5 , Qingdao Zeng 1, 2, 3, 4, 5 , Qiang Guo 5, 6, 7, 8 , Erjun Zhou 1, 2, 3, 4, 5
Affiliation
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Two donor–π–acceptor (D–π–A) type polymers (PE64 and PE65) with pentacyclic dithieno[2,3-d; 2′,3′-d′]benzo[1,2-b; 4,5-b′]dithiophene (DTBDT) as the electron-donating (D) unit and quinoxaline (Qx) as the electron-accepting (A) unit were designed to extend the application of DTBDT in non-fullerene organic solar cells (OSCs). The impact of introducing chlorine atoms at the two-dimensional thiophene side chain of the DTBDT unit on the photovoltaic performance was investigated by blending with two distinct non-fullerene acceptors (NFAs) of ITIC and Y6. We found that chlorinated polymer PE65 exhibited superior charge separation and transport due to the balanced crystallinity and miscibility when blending with acceptors. Thus, PE65 exhibited higher power conversion efficiencies (PCE) of 13.01% (Y6 as the acceptor) and 9.13% (ITIC as the acceptor) than non-chlorinated polymer PE64 (4.69% for PE64:ITIC and 3.54% for PE64:Y6). It is noteworthy that all three parameters (open-circuit voltage, short-circuit current and fill factor, abbreviated as VOC, JSC and FF) are largely improved simultaneously, which can be attributed to the adjusted energy levels, molecular crystallinity, blend film morphology and charge carrier mobility. The magnitude of differences of photovoltaic performance between PE64 and PE65 demonstrates the significance of introducing chlorine atoms at the thiophene side chain of the DTBDT unit on tuning the photoelectric and morphological properties and constructing various promising p-type photovoltaic polymers.
中文翻译：
氯化二噻吩并苯并二噻吩（DTBDT）基聚合物，以同时改善非富勒烯有机太阳能电池的VOC，JSC和FF
两个供体-π -受体（d-π-A）型聚合物（PE64和PE65）与五环二噻吩并[2,3- d ; 2′，3′- d ′]苯并[1,2- b；设计了4,5- b ']二噻吩（DTBDT）作为电子给体（D）单元和喹喔啉（Qx）作为电子接受（A）单元，以扩展DTBDT在非富勒烯有机太阳能电池中的应用（ OSC）。通过与ITIC和Y6的两个不同的非富勒烯受体（NFA）混合，研究了在DTBDT单元的二维噻吩侧链上引入氯原子对光伏性能的影响。我们发现氯化聚合物PE65与受体混合时，由于平衡的结晶度和可混溶性，因此具有优异的电荷分离和传输能力。因此，PE65表现出13.01％以上的功率转换效率（PCE）（Y6作为受体）和9.13％（ITIC作为受体）比非氯化聚合物PE64（4.69％为PE64：ITIC为和3.54％PE64：Y6） 。值得注意的是，所有三个参数（开路电压，短路电流和填充系数，缩写为V OC，J SC和FF）在很大程度上同时得到了改善，这可以归因于调节后的能级，分子结晶度，共混膜形态和载流子迁移率。的之间的光伏性能差的大小PE64和PE65演示在DTBDT单元的噻吩侧链上引入调谐氯原子光电和形态性质和构造的各种希望的p型光生伏打聚合物的意义。
更新日期：2020-09-21
中文翻译：
氯化二噻吩并苯并二噻吩（DTBDT）基聚合物，以同时改善非富勒烯有机太阳能电池的VOC，JSC和FF
两个供体-π -受体（d-π-A）型聚合物（PE64和PE65）与五环二噻吩并[2,3- d ; 2′，3′- d ′]苯并[1,2- b；设计了4,5- b ']二噻吩（DTBDT）作为电子给体（D）单元和喹喔啉（Qx）作为电子接受（A）单元，以扩展DTBDT在非富勒烯有机太阳能电池中的应用（ OSC）。通过与ITIC和Y6的两个不同的非富勒烯受体（NFA）混合，研究了在DTBDT单元的二维噻吩侧链上引入氯原子对光伏性能的影响。我们发现氯化聚合物PE65与受体混合时，由于平衡的结晶度和可混溶性，因此具有优异的电荷分离和传输能力。因此，PE65表现出13.01％以上的功率转换效率（PCE）（Y6作为受体）和9.13％（ITIC作为受体）比非氯化聚合物PE64（4.69％为PE64：ITIC为和3.54％PE64：Y6） 。值得注意的是，所有三个参数（开路电压，短路电流和填充系数，缩写为V OC，J SC和FF）在很大程度上同时得到了改善，这可以归因于调节后的能级，分子结晶度，共混膜形态和载流子迁移率。的之间的光伏性能差的大小PE64和PE65演示在DTBDT单元的噻吩侧链上引入调谐氯原子光电和形态性质和构造的各种希望的p型光生伏打聚合物的意义。
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