Vertical Composition Distribution and Crystallinity Regulations Enable High-Performance Polymer Solar Cells with &gt;17% Efficiency

Li, Qingduan; Wang, Liming; Liu, Shengjian; Guo, Lanhui; Dong, Shengyi; Ma, Guorong; Cao, Zhiping; Zhan, Xiaozhi; Gu, Xiaodan; Zhu, Tao; Cai, Yue‐Peng; Huang, Fei

doi:10.1021/acsenergylett.0c01927

Cited by 98 publications

(95 citation statements)

References 59 publications

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“…In relevant reports, DXO additives (DIO, DBrO, and DClO) would migrate from the active layer and affect the performance of OSCs. [ 31,32 ] To exclude the possible influence of additive on device stability, in this study, the PM7: IT‐4F‐based devices were prepared without additive.…”

Section: Resultsmentioning

confidence: 99%

Electric‐Induced Degradation of Cathode Interface Layer in PM7:IT‐4F Polymer Solar Cells

Dai

Zhang

et al. 2021

Solar RRL

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Cathode buffer layer interface modification is a commonly used strategy to prepare high‐efficient organic solar cells (OSCs). Nonfullerene OSCs based on PM7:IT‐4F are prepared and modified with poly[(9,9‐bis(3′‐(N,N‐dimethylamino)propyl)‐2,7‐fluorene)‐alt‐2,7‐(9,9‐dioctylfluorene)] (PFN)‐Br cathode buffer layer. The introduction of the PFN‐Br buffer layer obviously boosts the photovoltaic performance of PM7:IT‐4F‐based OSCs, however, the stability of the PFN‐Br‐modified device shows a serious degradation. By excluding the influence of heat, oxygen, moisture, and light illumination, the degradation is verified to be triggered by the electric effect. As soon as the devices undergo electrical measurement such as applying a bias voltage for the current density–voltage test, the degradation begins. The degradation mechanism of the PFN‐Br‐modified OSCs is investigated in detail with intensity modulated photovoltage spectroscopy/photocurrent spectroscopy (IMPS/IMVS), photoinduced charge extraction linear increasing voltage (Photo‐CELIV), and impendence spectroscopy (IS) technology. The results show that the PFN‐Br cathode buffer layer is deteriorated and increases the interface resistance between active layer and cathode, which hinders charge transport and collection at the electrode, thus weakening the performance of PM7:IT‐4F‐based OSCs. The degradation of PM7:IT‐4F/PFN‐Br OSCs induced by the electric effect proposed herein provides a new inspiration for the degradation study of OSCs.

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Section: Resultsmentioning

confidence: 99%

Electric‐Induced Degradation of Cathode Interface Layer in PM7:IT‐4F Polymer Solar Cells

Dai

Zhang

et al. 2021

Solar RRL

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“…By proper choices and matching of donor and acceptor materials, optimal bulk‐heterojunction (BHJ) morphology can be achieved, thus leading to excellent photovoltaic performance. [ 34–36 ]…”

Section: Introductionmentioning

confidence: 99%

Achieving Efficient Ternary Organic Solar Cells Using Structurally Similar Non‐Fullerene Acceptors with Varying Flanking Side Chains

Chang

Zhang

Chen

et al. 2021

Advanced Energy Materials

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In this work, the properties and performance of three structurally similar non‐fullerene acceptors (named BTP‐Ph, BTP‐Th, and BTP‐C11) possessing different side chains on the β‐positions of the thienothiophene units of the Y6 molecule are systematically studied. The steric and electronic effects of these side chains on the blend morphology and device performance based on the PTQ10 donor polymer are investigated. It is found that the thiophene and benzene units on the side chains introduce more steric hindrance and thus slightly reduce the crystallinity of the molecule. However, an interesting matching trend with the PTQ10 donor that appears to better match with the less crystalline molecules is observed. Overall, PTQ10:BTP‐Ph delivers the highest performance of 17.1% due to the suitable phase separation among three blends. Next, a ternary strategy is explored by incorporating BTP‐Th/BTP‐C11 with better molecular packing into PTQ10:BTP‐Ph, which successfully extends photon response, enhances charge transport, and suppresses charge recombination compared with the binary blend. Due to these synergistic effects, the ternary device based on PTQ10:BTP‐Ph:BTP‐Th achieves an outstanding power conversion efficiency of 17.6% with a fill factor of 78.8%, which is the highest value of PTQ10‐based devices to date.

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“…Bulk heterojunction (BHJ) active layer‐based polymer solar cells (PSCs) have gained significant interest due to their advantages such as light‐weight, flexibility, low cost, and scalable large‐scale manufacturing. [ 1–6 ] Additionally, recent initiation of nonfullerene small molecule acceptors (NFSMAs) [ 7–15 ] has resulted to significant improvement in the power conversion efficiency (PCE) of the single BHJ PSCs in the range of 17–18% [ 16–21 ] since NFSMAs overcome the several limitations of the fullerene‐based acceptors, such as poor light absorption, less tunability of optical and electrochemical properties, and large phase separations. In order to fabricate the high performance NFSMA‐based PSCs, there should be the balance optimization between the polymer donors and NFSMAs in the BHJ active layers, [ 22,23 ] since the overall photovoltaic parameters are predominantly governed by the intimate interplays between the two materials employed.…”

Section: Introductionmentioning

confidence: 99%

New Dithiazole Side Chain Benzodithiophene Containing D–A Copolymers for Highly Efficient Nonfullerene Solar Cells

Кештов

Константинов

Ostapov

et al. 2021

Macro Chemistry & Physics

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To examine the effects of pendent alkyl chain on the benzodithiophenedione (BDD) acceptor in the donor–acceptor (D–A) conjugated copolymers, two D–A copolymers with same thiazole ring substituted benzo[1,2‐b:4,5‐b′]dithiophene (BDTTz) and different acceptors BDD with two pendent alkyl units PBDTTz‐BDD and one pendent alkyl unit in benzo[1,2‐b:4,5‐c′]dithiophene‐4,8‐dione (BDTD) PBDTTz‐BDTD are synthesized. There is small effect on the optical properties but significant effect on the intermolecular π–π stacking, charge transport, and photovoltaic performance. PBTTz‐BDTD (with one pendent alkyl chain) on the BDD exhibits smaller π–π stacking distance as compared to PBDTTz‐BDD (with two pendent alkyl chains). The balanced charge carrier mobilities for the PBDTTZ‐BDTD based blends than those for PBDTTz‐BDD based blends are beneficial for suppressing the recombination processes, resulting in higher short circuit current and fill factor for the polymer solar cells (PSCs) based on PBDTTz‐BDTD. Combined with BThIND or Y6 as acceptor, PBDTTZ‐BDTD based PSCs show power conversion efficiency of 12.85% and 14.08%, respectively, which are larger than that for PBDTTz‐BDD counterparts (10.46% and 10.90% for BThIND and Y6, respectively). Thus, the photovoltaic performance of the D–A copolymer donors can be regulated through the slight variations of the pendent alkyl chains in the BDD acceptor unit.

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Vertical Composition Distribution and Crystallinity Regulations Enable High-Performance Polymer Solar Cells with >17% Efficiency

Cited by 98 publications

References 59 publications

Electric‐Induced Degradation of Cathode Interface Layer in PM7:IT‐4F Polymer Solar Cells

Electric‐Induced Degradation of Cathode Interface Layer in PM7:IT‐4F Polymer Solar Cells

Achieving Efficient Ternary Organic Solar Cells Using Structurally Similar Non‐Fullerene Acceptors with Varying Flanking Side Chains

New Dithiazole Side Chain Benzodithiophene Containing D–A Copolymers for Highly Efficient Nonfullerene Solar Cells

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