Efficient all polymer solar cells from layer-evolved processing of a bilayer inverted structure

Yao, Kai; Intemann, Jeremy J.; Yip, Hin‐Lap; Liang, Po Wei; Chang, Chih Yu; Zang, Yue; Li, Zhong'An; Chen, Yiwang; Jen, Alex K.‐Y.

doi:10.1039/c3tc31945h

Cited by 37 publications

(35 citation statements)

References 35 publications

(11 reference statements)

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“…ZnO layer works as a hole blocking layer with relatively large bandgap, which can effectively reduce the dark current and improve the rectifying characteristics. We further insert a thin PEIE layer between ZnO and the ternary heterojunctions, which helps to passivate the interfaces and align the energy levels . For comparison, we also fabricated photodetectors based on PTB7‐Th: PC 71 BM and PTB7‐Th: CO i 8DFIC binary BHJs with the same donor/acceptor ratio of 1:1.5 and relatively thick junction of ≈190 nm.…”

Section: Resultsmentioning

confidence: 99%

Visible to Near‐Infrared Photodetection Based on Ternary Organic Heterojunctions

Meng

et al. 2019

Adv Funct Materials

108

110

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Organic semiconductors have attracted tremendous attention in the past few years, thanks to their excellent flexibility, solution-processability, low-cost, chemical versatility, etc. Particularly, organic solar cells based on ternary heterojunctions have shown remarkable device performance, with the recent development of nonfullerene acceptor materials. These novel materials are also promising for photodetection. However, there are several key limits facing organic photodetectors, such as relatively large bandgaps, poor charge transport, and stability. In this work, a novel nonfullerene acceptor-CO i 8DFIC-is introduced, blended with a fullerene derivative and a donor to form ternary heterojunctions. After optimization, photodiodes based on such ternary blends exhibit compelling performance metrics, including low dark current, decent responsivity, large linear dynamic range, fast response, and excellent stability. This device performance is actually on a par with the established silicon technology, suggesting great potential for photodetection and imaging.

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Section: Resultsmentioning

confidence: 99%

Visible to Near‐Infrared Photodetection Based on Ternary Organic Heterojunctions

Meng

et al. 2019

Adv Funct Materials

108

110

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“…A relaxed design idea is to develop molecular acceptors with comparable energy levels as those of fullerenes. 15,16 Several research groups have achieved certain degree of success in these efforts. All-polymer solar cells showing PCE as high as 6.7% have been reported.…”

Section: Introductionmentioning

confidence: 99%

Development and Structure/Property Relationship of New Electron Accepting Polymers Based on Thieno[2′,3′:4,5]pyrido[2,3-g]thieno[3,2-c]quinoline-4,10-dione for All-Polymer Solar Cells

et al. 2015

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Article Development and structure/property relationship of new electronaccepting polymers based on thieno[2',3':4,5]pyrido[2,3-g]thieno[3,2-c]quinoline-4,10-dione for all-polymer solar cells ABSTRACT: Several electron accepting polymers having weak accepting-strong accepting (WA-SA) and strong accepting-strong accepting (SA-SA) monomer alternation were synthesized for studies of structure/property relationship in all-polymer solar cells. Two kinds of cyclic amide monomers, 4,10-bis(2-butyloctyl)-thieno[2',3':5,6]pyrido[3,4-g]thieno-[3,2-c]isoquinoline-5,11-dione (TPTI) and 5,11-bis(2-butyloctyl)-thieno[2',3':4,5]pyrido[2,3-g]thieno[3,2-c]quinoline-4,10-dione (TPTQ) were synthesized as weak accepting monomers (WA). Difluorinated TPTQ (FTPTQ) and well-known perylene diimide (PDI) monomers were synthesized as strong electron accepting monomers (SA). By using 1-chloronaphthalene (CN) as a co-solvent, the morphology of the polymer blended films can be finely tuned to achieve better ordering toward face-on mode and favorable phase separation between electron donor and acceptor, resulting in significant enhancement of short circuit current (J sc ) and fill factor (FF). The fluorination in TPTQ unit reduced the dipole moment of D-A complex and gave a negative effect on a polymer system. PFP showed worse electron accepting property with lower electron mobility than PQP. It is reasoned that the internal polarization plays an important role in the design of electron accepting polymers. As a result, PQP having TPTQ monomer exhibited best photovoltaic performance with power conversion efficiency (PCE) of 3.52 % (V oc = 0.71 V, J sc = 8.57 mA/cm 2 , FF = 0.58) at a weight ratio of PTB7-Th:PQP = 1:1, under AM 1.5G.

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“…The depressed changes were also been presented in the EQE spectra ( poor performance in the ternary system with amorphous and semi-crystalline blending should be ascribed to poor miscibility between two types of polymer. [ 34 ] The roughness (rms ≈ 13.5 nm) of P3HT:LP4 blending fi lm [ 33 ] is signifi cantly larger than that of the ladder-type polymer blending fi lm (rms ≈ 1.29 nm for LP2:LP4), as shown in Figure S8, Supporting Information. The inhomogeneous mixing leads to severe bimolecular recombination losses in the system.…”

Section: Communicationmentioning

confidence: 96%

“…[ 32 ] We have previously demonstrated that the effi cient charge transfers between P3HT:LP4 due to their cascade energy levels. [ 33 ] In order to match the blending ratios of both donor materials, we use the ratio as 3:1:3 in the P3HT:LP4:PC 71 BM ternary device. It is clear from Figure 5 A that the photocurrent in the ternary system decreased significantly compared with both of the binary devices.…”

Section: Communicationmentioning

confidence: 99%

A Simple and Universal Method to Increase Light Absorption in Ternary Blend Polymer Solar Cells Based on Ladder‐Type Polymers

Yao

et al. 2015

Advanced Optical Materials

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1wileyonlinelibrary.com COMMUNICATION effi cient exciton separation and charge transport to the electrodes. [ 14 ] In addition, You and co-workers recently presented a parallel strategy and demonstrated that holes generated from different donor polymers would mainly travel through their corresponding polymer-linked channels to the anode. [ 15 ] Therefore, ternary polymer solar cells can be separated into three categories: cascade charge transfer, energy transfer, and parallellike charge transfer/transport based on their photophysical processes. [ 12,16 ] In the parallel-like bulk heterojunction (PBHJ) solar cell, we can employ two or more polymers with different band gaps at any composition, regardless of their energy levels and band gaps. The V oc of such PBHJ cells varies according to the composition of the mixed donors, but falls in between those values of binary devices, not determined by the smallest energy difference between the HOMO levels of the donors and the LUMO level of fullerene. [ 17 ] Street et al. proposed alloy model to explain the observed tunable V oc in these ternary solar cells. [ 18 ] While the highest J sc of these ternary devices can surpass the values of those binary devices due to the expanded light harvesting. However, ternary blend poses complicated impact on the bulk heterojunction nanomorphology as compared to devices based on binary blends. Both the chemical structure and the crystallinity properties are the parameters involving with the morphology. This imposes stringent requirements on the selection of appropriate materials, thereby limiting the scope and application of this multiblend approach.Recently, numerous ladder-type polymers based on fusedring, ladder-type donors with various band gaps have been developed for BHJ devices. Thanks to their large fused aromatic/heteroaromatic structures utilized, not only the charge transport properties will be enhanced due to the reduced reorganization energy, but also the absorption ability will be increased because of the elongated effective conjugation length. [ 19 ] By tuning the aromatic units incorporated or introducing heteroatoms, the donor strength of ladder-type donor could be changed. And combined with acceptor units with different strength, the energy levels and band gaps of ladder-type polymers could be fi nely tailored. [ 20 ] Moreover, because of the out-of-plane side chains of ladder-type polymers inhibiting their ordered interchain packing, most of them demonstrated amorphous nature. Thus the morphology of ladder-type polymers/ fullerene derivative based BHJ blends is quite insensitive to the processing conditions, without any additives or even postsolvent/thermal annealing. [ 21 ] Here, inspired by the recent advances in wide variety of multiple fused-ring systems, we proposed the use of different ladder-type copolymers as the donor materials for ternary

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Efficient all polymer solar cells from layer-evolved processing of a bilayer inverted structure

Cited by 37 publications

References 35 publications

Visible to Near‐Infrared Photodetection Based on Ternary Organic Heterojunctions

Visible to Near‐Infrared Photodetection Based on Ternary Organic Heterojunctions

Development and Structure/Property Relationship of New Electron Accepting Polymers Based on Thieno[2′,3′:4,5]pyrido[2,3-g]thieno[3,2-c]quinoline-4,10-dione for All-Polymer Solar Cells

A Simple and Universal Method to Increase Light Absorption in Ternary Blend Polymer Solar Cells Based on Ladder‐Type Polymers

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