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Ester-substituted Pentathiophene Copolymer based Sky-blue Semitransparent Solar Cells for Building Windows
摘要： For oligothiophene-based donor polymers, the reports of pentathiophene are rare, while other oligothiophene (bi-, ter- and quaterthiophene) have been broadly studied. Here, we synthesized one wide-band-gap (1.88 eV) polymer PFTzTT-3TC, based on ester-substituted pentathiophene and benzotriazole. PFTzTT-3TC: ITIC (1.0:1.0) -based polymer photovoltaic cells exhibited best PCE of 8.21% and Voc of 0.90 V without additive (such as DIO, 1-CN) or post-treatment. These are the highest PCE and Voc for ester-substituted pentathiophene-based devices to date. Furthermore, semitransparent polymer photovoltaic cells with an active blend of PFTzTT-3TC: ITIC (1.0:1.0) demonstrate a similar Voc of 0.89V and a PCE of 6.43% with an AVT of 26.77% and an AT of 30.58% and CIE (0.25, 0.21). The sky-blue of semitransparent devices is useful for photosynthesis in plants and visual comfort in human and make it suitble for building windows.
关键词： benzotriazole,ester-substituted pentathiophene,organic photovoltaic,building windows,semitransparent polymer photovoltaic cells
更新于2025-09-12 10:27:22
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Modulation of Three p-Type Polymers Containing a Fluorinated-Thiophene-Fused-Benzotriazole Unit To Pair with a Benzotriazole-Based Non-fullerene Acceptor for High <i>V</i> <sub/>OC</sub> Organic Solar Cells
摘要： Three 6-?uoro-thieno[2′,3′:4,5]benzo[1,2-d][1,2,3]triazole (fBTAZT) containing copolymers, named as PfBTAZT-H, PfBTAZT-F, and PfBTAZT-Cl, were employed to pair with a benzo[1,2-d][1,2,3]triazole (BTA) based non-fullerene acceptor BTA3 for the applicaition in organic solar cells (OSCs). By introducing ?uorine or chlorine atoms into the thiophene side chains on BDT units, the highest occupied molecular orbital (HOMO) energy levels of polymers shift down in sequence, and PfBTAZT-Cl shows an obvious blue-shift of absorption spectrum. PfBTAZT-F:BTA3-based OSC attains a VOC of 1.05 V, a JSC of 11.83 mA cm?2, and FF of 0.62, leading to a PCE of 7.69%, which are higher than that of PfBTAZT-H:BTA3 (VOC = 0.99 V, JSC = 11.60 mA cm?2, FF = 0.58, and PCE = 6.65%) due to its well-matched HOMO energy level, higher charge mobilities, and favorable ?lm morphology. More surprisingly, chlorinated polymer PfBTAZT-Cl obtains the highest VOC of 1.20 V and PCE of 8.00%, which is attributed to the lowest HOMO energy level, largely decreased voltage loss (ΔVloss = 0.56 V compared to 0.77 V for PfBTAZT-H:BTA3 0.71 V for PfBTAZT-F:BTA3), more complementary absorption with that of BTA3, and e?ective charge generation. Our results demonstrate that chlorination is an e?ective approach to realize a high PCE and VOC and thiophene-fused benzotriazole (BTAZT) based polymers are also good candidates for material combinations in “Same-A-Strategy” (SAS).
关键词： fluorinated-thiophene-fused-benzotriazole,PCE,non-fullerene acceptor,organic solar cells,high VOC,benzotriazole-based
更新于2025-09-11 14:15:04
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Fluorine Substituted Benzotriazole Core Building Block Based Highly Efficient Hole Transporting Materials for Mesoporous Perovskite Solar Cells
摘要： Two novel donor-accepter-donor (D-A-D) structured hole transporting materials based on fluorine substituted benzotriazole (BTA) core building block (2FBTA-1, 2FBTA-2) are designed and synthesized through the molecular regulation. Applied these materials into perovskite solar cell (PSC), power conversion efficiencies (PCEs) of 7.55 % and 17.94% are obtained for 2FBTA-1 and 2FBTA-2, respectively. The better photovoltaic performance of 2FBTA-2 could be attributed to its more suitable energy level, more planar molecular configurations and higher hole mobility. Moreover, the devices with 2FBTA-2 as HTM show good stability under the air condition. The results qualify the BTA promising building block for future HTM design.
关键词： perovskite solar cell,photovoltaic,benzotriazole,hole transporting material
更新于2025-09-11 14:15:04
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Comparative study on the effects of alkylsilyl and alkylthio side chains on the performance of fullerene and non-fullerene polymer solar cells
摘要： Two novel high gap donor polymers – PBDTTSi-TzBI and PBDTTS-TzBI, based on imide fused benzotriazole (TzBI) with asymmetric side chains and alkylsilyl (Si) or alkylthio (S) substituted 4,8-di(thien-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDTT) – are successfully synthesized. The effect of the side chain variation on the photophysical, morphological and photovoltaic properties of blends of these polymers with fullerene and non-fullerene acceptors is investigated. The PBDTTSi-TzBI polymer shows a deeper highest occupied molecular orbital energy level, which results in higher open-circuit voltages. Nevertheless, the polymer solar cells fabricated using PBDTTS-TzBI in combination with PC71BM afford a higher power conversion efficiency of 7.3% (vs 4.0% for PBDTTSi-TzBI:PC71BM). By using the non-fullerene acceptor ITIC, the absorption of the blends extends to 850 nm and better device efficiencies are achieved, 6.9% and 9.6% for PBDTTSi-TzBI:ITIC and BDTTS-TzBI:ITIC, respectively. The better performance for PBDTTS-TzBI:ITIC is attributed to the strong and broad absorption and balanced charge transport, and is among the best so far for non-fullerene solar cells based on TzBI-containing polymer donors.
关键词： Alkylthio,Benzotriazole,Alkylsilyl,Polymer solar cells,Non-fullerene acceptors,Photovoltaic properties
更新于2025-09-11 14:15:04
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Synthesis and Characterization of Four Random copolymers Containing Fluorene as Electron Donors and Benzotriazole, Benzothiadiazole, Pyrido[3,4-b]pyrazine as Electron Acceptors
摘要： Four random copolymers containing fluorene as electron donors and benzotriazole, benzothiadiazole, pyrido[3,4-b]pyrazine as electron acceptors were successfully synthesized. Afterwards, a series of characterization, including cyclic voltammetry (CV), spectroelectrochemistry, kinetics, colorimetry and thermal gravimetric analysis were carried out to fully investigate the properties of the copolymers we got. Their band gaps are 1.87 eV, 1.91 eV, 1.97 eV and 1.98 eV, respectively. From neutral state to oxidized state, PFPP changes from thistle to transparent gray, PBTFPP changes from tan to transparent gray, PBTFBD changes from sienna to lightslategray, and PBDFBD changes from rosybrown to lightgrey. The coloration efficiencies are 269.91cm2·C-1 for PFPP, 177.45cm2·C-1 for PBTFPP, 241.92cm2·C-1 for PBTFBD, and 174.67cm2·C-1 for PBDFBD in near infrared region. Except for PFPP, all the other three copolymers are stable and could be good candidates in electrochromic application.
关键词： benzothiadiazole,fluorene,benzotriazole,conducting polymers,pyrido[3,4-b]pyrazine
更新于2025-09-10 09:29:36