Triarylamine-based crosslinked hole-transporting material with an ionic dopant for high-performance PEDOT:PSS-free polymer solar cells

Tsai, Che En; Liao, Ming Hung; Chen, Yung Lung; Cheng, Sheng Wen; Lai, Yinchieh; Cheng, Yen‐Ju; Hsu, Chain‐Shu

doi:10.1039/c5tc00714c

Cited by 27 publications

(23 citation statements)

References 81 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…28 New solution-processable HTMs are still in demand and chemistry scientists have made great effort to explore new alternative materials. [29][30][31][32][33][34][35][36] Recently, we reported that PEDOT:SL as hole transporting material exhibited promising performance in polymer solar cells. 37 In order to study the effect of -OH and aggregation behaviour of lignosulfonate for the performance of PSCs, we choose LS and ALSs as starting materials in our previous manuscript 14 to study the effect in detail.…”

Section: Introductionmentioning

confidence: 99%

Effect of aggregation behavior and phenolic hydroxyl group content on the performance of lignosulfonate doped PEDOT as a hole extraction layer in polymer solar cells

et al. 2015

View full text Add to dashboard Cite

†Electronic Supplementary Information (ESI) available: [the results including SEM images of various block-like self-assemblies from LS and ALS; DLS measurement of LS solution and ALS solution in H2O/EtOH (v/v, 1/3); Proposed schematic for the polymerization of EDOT in the presence of LS and ALS; UV absorption spectra of PEDOT:LS and PEDOT:ALS aqueous dispersion]. SeeUsing lignosulfonate (LS) and alkyl chain-coupled lignosulfonate-based polymer (ALS) as raw material, the aggregation behavior of LS and ALS was investigated, which all showed unique aggregation behavior to form block-like self-assembly for the first time. The aggregation behavior and mechanism of LS and ALS was investigated by SEM, TEM and DLS. The block-like aggregates prepared from ALS (micron size) were larger than that of LS (nano size). The unique aggregates were also further confirmed by XPS, meanwhile, SAXS was applied to explore the regular intrinsic characteristics of the blocklike aggregates. Inspired by the aggregation behavior of LS and ALS, the electron transfer properties of LS and ALS were also studied including electrochemical property and hole mobility measurement. The oxidation peaks at 1.2 V and 1.4 V were observed at the LS and ALS modified electrode, respectively. We studied hole transport property of LS and ALS with space-charge-limited current method (SCLC). The average hole mobilities of 2.95×10 -6 cm 2 V -1 s -1 and 3.18×10 -7 cm 2 V -1 s -1 were estimated for LS and ALS, respectively. The above results indicated that LS and ALS are potential water soluble polymeric p-type semiconductors, and the electron transfer property of LS is better than that of ALS. Based on the unique aggregation behavior and hole mobility above which will facilitate charge transport, water soluble PEDOT:LS and PEDOT:ALS were prepared and applied as hole extraction layer (HEL) in polymer solar cells. The PCE decreased with the decrease of phenolic hydroxyl group content (-OH), which suggested that -OH is important for the property of PCE. The application properties were consistent with the results of aggregation behavior and electron transfer properties. The power conversion efficiency (PCE) of 5.19% from PEDOT:LS-1:1 as HTL was achieved with device structure of ITO/HEL/PTB7:PC71BM/Al in our study. Our results showed the phenolic hydroxyl group content and conjugation structure of amorphous LS contribute its promising potential as dopant of semiconductors, such as PEDOT in organic electronics. Our result provides a novel perspective for the design of dopant for semiconductive polymer.All in one word, phenolic hydroxyl group of polymer will provide hole transport capability due to its oxidation during device orperation.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of aggregation behavior and phenolic hydroxyl group content on the performance of lignosulfonate doped PEDOT as a hole extraction layer in polymer solar cells

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Considering that the incorporation of thin PTB7‐TV layer does not increase the absorption of the active layer (see Figure S6 in the Supporting Information), the obviously increased J SC may be ascribed to the change of blend morphology. It is worthy to note that the device performance with PTB7‐TV as MIL is among the best reported for PSCs based on PTB7 with conventional configuration …”

Section: Resultsmentioning

confidence: 96%

A Cross‐Linkable Donor Polymer as the Underlying Layer to Tune the Active Layer Morphology of Polymer Solar Cells

Meng

Wang

et al. 2015

Adv Funct Materials

View full text Add to dashboard Cite

226 wileyonlinelibrary.com in conventional device structure, owing to the much larger surface energy of anode interlayer (normally poly(3,4-ethylenedioxy-thiophene) doped with poly(styrenesulfonate) (PEDOT:PSS), γ = 91.6 mJ m −2 ) than the air ( γ = 0), the donor with small surface energy ( γ = 20-22 mJ m −2 ) would prefer to enrich at the top (cathode side) and the acceptor with larger surface energy ( γ = 29 mJ m −2 ) would prefer to enrich at the bottom (anode side). [ 4 ] This vertical distribution of donor:acceptor is detrimental for charge carrier transporting/collection and leads to decreased PSC device performance. One effective approach to improve the vertical distribution of active layer is to use solvent additive, in which the solvent additive with high boiling point can dramatically change the fi lm-forming kinetics and consequently change the blend morphology. For example, Wu et al. [ 5 ] and Park and co-workers [ 6 ] have used specifi c solvent additives, which can selectively interact with the donor or the acceptor, to alter the vertical distribution in the active layer. Huang and co-workers [ 7 ] have obtained the desired compositionally graded active layer using methanol treatment to extract the acceptor to the top surface of active layer. However, the solvent additive approach is only applicable for a portion of PSCs because many high effi ciency PSCs use single solvent without solvent additive. [ 8 ] Therefore, it remains a great challenge to develop an alternative strategy to control the vertical phase separation of PSCs.The active layer morphology of PSCs is affected by the surface property of the underlying layer. [ 9 ] We have demonstrated an approach to improve the active layer morphology by using a phosphonate polymer spin-coated on PEDOT:PSS surface as the morphology-inducing layer (MIL). [ 10 ] However, the fabrication of multilayer PSC devices requires orthogonal solvent processing, which constrains the choice of processing solvent and leads to limited device performance.Here, we use a cross-linkable polymer as the underlying MIL to tune the vertical composition distribution of donor:acceptor blend in the active layer, which provides solvent selection fl exibility to process active layer and leads to improved PSC device performance. As shown in Scheme 1 , with poly(thieno[3,4-b ]-thiophene/benzodithiophene):[6,6]-phenyl C 71 -butyric acid methyl ester (PTB7:PC 71 BM) as the active layer, [ 11 ] we develop the MIL material, poly{ [4,8-bis[(undec-10-enyl)

show abstract

“…The relevant strategies reported include the introduction of additives, the invention of hybrid layers as HTLs by building one layer onto PEDOT:PSS, and solvent-aided surface treatment, in a certain way resulting in the tuned work function, enhanced conductivity and improved stability of PEDOT:PSS [14][15][16][17][18][19] . What's more, advanced solutions to replace PEDOT:PSS with alternative hole transporting materials have been documented in recent studies, proposing that the semi-metallic nature of PEDOT:PSS is the major obstacle to constrain its electron blocking capacity, additionally the devices fabricated based on PEDOT:PSS suffers from unstable morphology and electrical inhomogeneity [20,21] . Therefore, it is of great importance and urgent need to develop new material systems to supersede the traditional hole transporting material of PEDOT:PSS.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, the alternative materials proved potentially to substitute PEDOT:PSS basically fall into the categories of metal oxides, carbon-based materials and conducting polymers [20][21][22][23][24][25][26] . However, few studies on employing small molecules as an independent HTL in the fabrication of OSC devices were reported.…”

Section: Introductionmentioning

confidence: 99%

TTA as a potential hole transport layer for application in conventional polymer solar cells

Liu

Zhou

Zhao

et al. 2020

Journal of Energy Chemistry

View full text Add to dashboard Cite

Triarylamine-based crosslinked hole-transporting material with an ionic dopant for high-performance PEDOT:PSS-free polymer solar cells

Abstract: A triarylamine-based crosslinked hole-transporting material is integrated with an ionic dopant to achieve high-performance PEDOT:PSS-free polymer solar cells.

Cited by 27 publications

References 81 publications

Effect of aggregation behavior and phenolic hydroxyl group content on the performance of lignosulfonate doped PEDOT as a hole extraction layer in polymer solar cells

Effect of aggregation behavior and phenolic hydroxyl group content on the performance of lignosulfonate doped PEDOT as a hole extraction layer in polymer solar cells

A Cross‐Linkable Donor Polymer as the Underlying Layer to Tune the Active Layer Morphology of Polymer Solar Cells

TTA as a potential hole transport layer for application in conventional polymer solar cells

Contact Info

Product

Resources

About