Chemical reaction between an ITIC electron acceptor and an amine-containing interfacial layer in non-fullerene solar cells

Hu, Lin; Liu, Yun; Mao, Lin; Xiong, Sixing; Sun, Lulu; Zhao, Nan; Qin, Fei; Jiang, Youyu; Zhou, Yinhua

doi:10.1039/c7ta10306a

Cited by 131 publications

(138 citation statements)

References 28 publications

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“…Figure b shows some typical chemical structures of n‐semiconductors, such as fullerene, diimide, and quinoid acceptors, that could be doped by anion n‐dopants, such as quaternary ammonium and phosphonium salts, and polyelectrolytes with Lewis base anions (anion X − = F − , Cl − , Br − , I − , OH − , AcO − , etc.) (Figure c) . The electron transfer between various Lewis base anions and n‐type semiconductors have been verified by electron spin resonance measurements ( Figure ), confirming the generation of radical anion signals from doped organic semiconductors .…”

Section: Solution‐processable Conductive Organics Via Anion‐induced Nsupporting

confidence: 79%

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Yan

2019

Macro Chemistry & Physics

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The essential challenge for accessing high‐performance organic optoelectronics strongly relies on how to enable organic materials with high charge transport capabilities. This short review gives an elucidation of the mild n‐doping that occurs between Lewis base anions and n‐semiconductors, as well as their extension to develop solution‐processable conductive interlayers for organic and perovskite solar cells.

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Section: Solution‐processable Conductive Organics Via Anion‐induced Nsupporting

confidence: 79%

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Yan

2019

Macro Chemistry & Physics

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“…Polymer solar cells (PSCs) have attracted great attention for their advantages such as flexibility, light weight, and low‐cost production . In the past decades, extensive efforts have been devoted to the development of photovoltaic materials and device engineering, urging the power conversion efficiencies (PCEs) of the single‐junction PSCs recently up to 14% .…”

Section: Introductionmentioning

confidence: 99%

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Liao

Xie

Chen

et al. 2019

Adv Funct Materials

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The fluorobenzotriazole (FTAZ)‐based copolymer donors are promising candidates for nonfullerene polymer solar cells (PSCs), but suffer from relatively low photovoltaic performance due to their unsuitable energy levels and unfavorable morphology. Herein, three polymer donors, L24, L68, and L810, based on a chlorinated‐thienyl benzodithiophene (BDT‐2Cl) unit and FTAZ with different branched alkyl side chain, are synthesized. Incorporation of a chlorine (Cl) atom into the BDT unit is found to distinctly optimize the molecular planarity, energy levels, and improve the polymerization activity. Impressively, subtle side chain length of FTAZ realizes a dramatic improvement in all the device parameters, as revealed by the short‐current density (Jsc) improved from 7.41 to 20.76 mA cm−2, fill‐factor from 36.3 to 73.5%, and even the open‐circuit voltage (Voc) from 0.495 to 0.790 V. The best power conversion efficiency (PCE) of 12.1% is obtained from the L810‐based device, which is one of the highest values reported for FTAZ‐based PSCs so far. Notably, the corresponding external quantum efficiency curve keeps a very prominent value up to 80% from 500 to 800 nm. The notable performance is discovered from the reduced energy loss, improved molecular face‐on orientation, the down‐shifted energy levels, and optimized absorption coefficient regulated by side‐chain engineering.

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“…Figure S7, Supporting Information depicts J 0.5 versus V appl – V bi plotted for Mott–Gurney SCLC fitting of the electron‐only devices ITO/PBTz‐TMAI or PBTz‐SO 3 Na or CH 3 OH /Al. [ 30 ] Electron mobility was calculated by the Mott–Gurney SCLC formula [ 31,32 ] :

J = (9 ​ / ​ 8) μ_{e} ε_{o} ε_{r} (V^{2} ​ / ​ L^{3})

where J is the current density, µ e is the electron mobility, ε o is the dielectric constant of free space (ε o = 8.85 × 10 −12 F m −1 ), ε r is the permittivity of active layer, V is the internal voltage of the device, and L is the thickness of active layer. The electron mobility for the device with CH 3 OH layer was only 2.2 × 10 −4 cm 2 V −1 s −1 , whereas those of PBTz‐TMAI and PBTz‐SO 3 Na interlayers were enhanced to 2.3 and 1.8 × 10 −3 cm 2 V −1 s −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Efficient Polymer Solar Cells Employing Solution‐Processed Conjugated Polyelectrolytes with Differently Charged Side Chains

Shi

Lü

et al. 2020

Macro Chemistry & Physics

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Poly(6‐(4,7‐dimethyl‐2H‐benzo[d][1,2,3]triazol‐2‐yl)‐N,N,N‐trimethylhexan‐1 aminium iodide) (PBTz‐TMAI) and poly(sodium 4‐(4,7‐dimethyl‐2H‐benzo[d] [1,2,3]triazol‐2‐yl)butane‐1‐sulfonate) (PBTz‐SO3Na) based on the same benzotriazole‐conjugated backbone but with ammonium and sulfonated side chains are designed and synthesized through side‐chain functionalization and Yamamoto polymerization, respectively, and are used as the cathode interlayers in fullerene‐ and non‐fullerene‐based polymer solar cells. The interfacial modification of PBTz‐TMAI and PBTz‐SO3Na onto the active layer achieves good energy alignment at cathode electrodes and optimized exciton‐dissociation efficiency from the active layer. Consequently, the power conversion efficiencies (PCEs) of 7.8% and 9.6% are obtained for the fullerene PTB7:PC71BM‐based and non‐fullerene PBDB‐T:ITIC‐based polymer solar cells (PSCs) with PBTz‐SO3Na interlayer. The PCS devices based on PTB7:PC71BM and PBDB‐T:ITIC active layers with PBTz‐TMAI interlayer achieved a remarkably improved performance with PCEs of 8.2% and 10.2%, respectively.

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Chemical reaction between an ITIC electron acceptor and an amine-containing interfacial layer in non-fullerene solar cells

Abstract: Non-fullerene acceptor ITIC can react with PEI (or PEIE), which destroys the original intramolecular charge transfer in ITIC.

Cited by 131 publications

References 28 publications

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Efficient Polymer Solar Cells Employing Solution‐Processed Conjugated Polyelectrolytes with Differently Charged Side Chains

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