Self-Organization of Amine-Based Cathode Interfacial Materials in Inverted Polymer Solar Cells

Ma, Di; Lv, Menglan; Lei, Ming; Zhu, Jin; Wang, Haiqiao; Chen, Xiwen

doi:10.1021/nn4059067

Cited by 72 publications

(87 citation statements)

References 51 publications

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“…22,[32][33][34][35] The surface energies of ITO, pDPP5T-2, PCBM, Phen-NaDPO, pDPP5T-2:PCBM and pDPP5T-2:PCBM:Phen-NaDPO were determined by measuring the droplet's contact angle for three liquids (ultrapure water, diiodomethane and ethylene glycol) using the Owens-Wendt and Kaelble method (Fig. 3a).…”

Section: Resultsmentioning

confidence: 99%

“…Wang et al 22 demonstrated that aminobased cathode interfacial materials (fullerene [6,6]-phenyl-C 61 -butyric acid 2-((2-(dimethylamino)-ethyl)(methyl)amino)ethyl ester (PCBDAN) and poly[(9,9-bis(3-(N,N-dimethylamino)propyl)-2,7-uorene)-alt-2,7-(9,9-dioctyluorene)] (PFN)) improve electron selective contacts with ITO when added into the P3HT:PC 61 BM solution at small concentrations. Lee et al 23 showed that polyethyleneimine (PEI) aligned on top of PEDOT:PSS when mixed into the photoactive materials, thereby signicantly simplifying the multi-junction processing.…”

Section: -27mentioning

confidence: 99%

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Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

et al. 2016

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We successfully demonstrate a simple approach to printing efficient, inverted organic solar cells (OSCs) with a self-organized charge selective cathode interface layer based on the small-molecule Phen-NaDPO.Different from previous studies, Phen-NaDPO molecules were blended into a polymer/fullerene blend, comprising a low bandgap diketopyrrolopyrrole-quinquethiophene alternating copolymer pDPP5T-2 and phenyl-C 61 -butyric acid methyl ester (PC 61 BM), and processed by doctor blading in air. We observed a spontaneous, surface energy driven migration of Phen-NaDPO towards the ZnO interface and a subsequent formation of electron selective and barrier free extraction contacts. In the presence of 0.5 wt% Phen-NaDPO, a PCE of 5.4% was achieved for the inverted device based on an ITO/ZnO cathode. Notably, the photovoltaic performances remained at the same level with increasing the Phen-NaDPO concentration in the active layer from 0.25 to 1 wt%.Furthermore, this approach could be proven to effectively work with other cathodes such as bare ITO and ITO/AZO. The self-organization of Phen-NaDPO through spontaneous vertical phase separation is mainly attributed to its high surface energy and strong interaction with the cathode material. The present results highlight that a self-organized cathode interfacial material processed from a "ternary" active layer is fully compatible with the requirements for roll-to-roll fabrication of inverted organic solar cells.

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Section: Resultsmentioning

confidence: 99%

Section: -27mentioning

confidence: 99%

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

et al. 2016

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“…By the Knoevenagel condensation of compound DCHO3TIDT with 2-ethylhexyl cyanoacetate or 2-(1,1-dicyanomethylene)-3-octyl rhodanine, the target molecules DCAO3TIDT and DCNR3TIDT were afforded. The exact structures of the two molecules were confirmed by 1 H NMR spectra, 13 C NMR spectra and other methods.…”

Section: Synthesis Of the Moleculesmentioning

confidence: 98%

“…Power conversion efficiency (PCE) which is higher than 9% has been reached recently [2][3][4][5][6][7][8][9][10][11][12][13][14]. Currently, BHJ OSCs are based on two types of donor materials, conjugated polymers and small molecules [15,16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photovoltaic properties of new small molecules with rhodanine derivative as the end-capped blocks

Zhou

Xiao

Liu

et al. 2015

Organic Electronics

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a b s t r a c tTwo new acceptor-donor-acceptor (A-D-A) type small molecules DCAO3TIDT and DCNR3TIDT, with 4,4,9,9-tetrakis(4-(dodecyloxy)phenyl)-4,9-dihydro-s-indaceno-[1,2-b:5,6-b 0 ]dithiophene (IDT) as the core group and 2-ethylhexyl cyanoacetate (CAO) and 2-(1,1-dicyanomethylene)-3-octyl rhodanine (CNR) as different end-capped blocks, have been designed and synthesized. Both of them have been employed as donor for solutionprocessed bulk hetero-junction (BHJ) organic solar cells (OSCs). The two compounds showed deep highest occupied molecular orbital (HOMO) energy levels ($À5.30 eV) and strong absorption. The DCAO3TIDT and DCNR3TIDT with PC 71 BM as acceptor based BHJ solar cell devices showed short circuit current density (J sc ) of 6.93 mA/cm 2 and 8.59 mA/ cm 2 , power conversion efficiency (PCE) of 3.34% and 4.27%, respectively, and with almost same open-circuit voltage ($0.93 V), under the illumination of AM 1.5 G, 100 mW/cm 2 . The high J sc for DCNR3TIDT could result from its wider and red-shifted absorption than that of DCAO3TIDT, which was probably induced by the end-capped block rhodanine derivative. The results demonstrate that the end group would be taken into full account when designing new solution-processed small molecules, which is an important factor to determine their photovoltaic properties.

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“…2,3,6,7 So far, these materials are rarely applied in the active layer of organic electronic devices because of the poor performance. [8][9][10][11][12][13] Therefore, understanding the influence of polar groups on photovoltaic performance of organic semiconductors is important for future materials development. In our previous work, an alcohol soluble narrowband-gap conjugated polymer and an alcohol soluble fullerene derivative, which were both functionalized with tertiary amino group, were synthesized and used as the donor and acceptor material in the active layer of polymer solar cell (PSC).…”

mentioning

confidence: 99%

The influence of amino group on PCDTBT-based and P3HT-based polymer solar cells: Hole trapping processes

Cai

Zhong

Duan

et al. 2015

Applied Physics Letters

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Polymer solar cells (PSCs) based on aliphatic-amino-functionalized materials presented low performance with negligibly small efficiency, the prime mechanism of which is found to be hole trapping induced by the amine end groups. We propose that such hole trapping behavior depends on the relative energetic position of the hole transport states and the trapping states. Herein, we comparatively study the photovoltaic properties of PSCs based on amino-functionalized fullerene derivative blended with poly [N-9′-heptadecanyl-2, 7-carbazole-alt-5, 5-(4′, 7′-di-2-thienyl-2′, 1′, 3′-benzothiadiazole)] (PCDTBT) or poly (3-hexylthiophene) (P3HT). The former polymer has a lower-positioning highest occupied molecular orbital (HOMO) level, whereas the latter has a comparable HOMO level relative to the ionization state of tertiary aliphatic amine in energy. Our investigation confirms our proposition, revealing an ultrafast trapping process in PCDTBT:amino-group-functionalized fullerene derivative film, which seriously crippled hole transport, consequently results in very poor device performance. In contrast, trapping process is almost negligible in P3HT systems.

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Self-Organization of Amine-Based Cathode Interfacial Materials in Inverted Polymer Solar Cells

Cited by 72 publications

References 51 publications

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

Synthesis and photovoltaic properties of new small molecules with rhodanine derivative as the end-capped blocks

The influence of amino group on PCDTBT-based and P3HT-based polymer solar cells: Hole trapping processes

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