Abstract
Bulk heterojunction organic solar cells based on active layer of PTB7-Fx (x = 0–100), conjugated block copolymer incorporating benzo[1,2-b:4,5-b′]dithiophene and partly fluorinated thieno[3,4-b]thiophene units, and fullerene derivatives as phenyl C61 and phenyl C71 butyric acid methyl esters sandwiched between a transparent anode of indium tin oxide, a hole conducting layer of either poly(ethylene dioxythiophene) : polystyrene sulfonate or magnetron-sputtered molybdenum oxide and evaporated aluminum cathodes were fabricated. Polymer-organic thin films were prepared at 1:1.5 mass ratio of the donor:acceptor mixture and deposited from dichlorobenzene solution of different concentrations by spin coating in ambient conditions. To control the active layer morphology, the films were subjected either to post-deposition treatments (annealing) at different temperatures or incorporation of an additive such as diiodooctane. Optical transmission, film surface topography and thickness measurements were used to characterize the active layer. Test devices with the architecture described above were prepared and their current–voltage characteristics, quantum efficiency and impedance spectra were measured and used to compare the different active layers, architectures and deposition sequences.
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References
An Q, Zhang F, Zhang J, Tang W, Denga Z, Hu B (2016) Versatile ternary organic solar cells: a critical review. Energy Environ Sci 9:281–322. https://doi.org/10.1039/c5ee02641e
Guo S, Herzig E, Naumann A, Tainter G, Perlich J, Müller-Buschbaum P (2014) Influence of solvent and solvent additive on the morphology of PTB7 films probed via X-ray scattering. J Phys Chem B 118:344–350. https://doi.org/10.1021/jp410075a
Guo S, Ning J, Körstgens V, Yao Y, Herzig EM, Roth SV, Müller-Buschbaum P (2015) The effect of fluorination in manipulating the nanomorphology in PTB7:PC71BM bulk heterojunction systems. Adv Energy Mater 5:1401315. https://doi.org/10.1002/aenm.201401315
Guo S, Wang W, Herzig E, Naumann A, Tainter G, Perlich J, Müller-Buschbaum P (2017) Solvent-morphology-property relationship of PTB7:PC71BM polymer solar cells. ACS Appl Mater Interfaces 9:3740–3748. https://doi.org/10.1021/acsami.6b14926
Hawkins D, Iddon B, Longthorne D, Rosyk P (1994) Synthesis of thieno-[2,3-b]-,-[3,2-b]-and-[3,4-b]-thiophenes and thieno-[3′,2′: 4,5]-,-[2′,3′: 4,5]-and-[3′,4′: 4,5]-thieno [3,2-d] pyrimidin-7(6H)-ones starting from thiophene. J Chem Soc Perkin Trans 1:2735–2743. https://doi.org/10.1039/P19940002735
He Z, Zhong C, Su S, Xu M, Wu H, Cao Y (2012) Enhanced power conversion efficiency in polymer solar cells using an inverted device structure. Nat Photonics 6:591–595. https://doi.org/10.1038/nphoton.2012.190
He X, Mukherjee S, Watkins S, Chen M, Qin T, Thomsen L, Ade H, McNeill C (2014) Influence of fluorination and molecular weight on the morphology and performance of PTB7:PC71BM solar cells. J Phys Chem C 118:9918–9929. https://doi.org/10.1021/jp501222w
Kong J, Hwang I, Lee K (2014) Top-down approach for nanophase reconstruction in bulk heterojunction solar cells. Adv Mater 26:6275–6283. https://doi.org/10.1002/adma.201402182
Liang Y, Wu Y, Feng D, Tsai S, Son H, Li G, Yu L (2009a) Development of new semiconducting polymers for high performance solar cells. J Am Chem Soc 131:56–57. https://doi.org/10.1021/ja808373p
Liang Y, Feng D, Wu Y, Tsai S, Li G, Ray C, Yu L (2009b) Highly efficient solar cell polymers developed via fine-tuning of structural and electronic properties. J Am Chem Soc 131:7792–7799. https://doi.org/10.1021/ja901545q
Liang Y, Xu Z, Xia J, Tsai S, Wu Y, Li G, Ray C, Yu L (2010) For the bright future- bulk heterojunction polymer solar cells with power conversion efficiency of 7.4%. Adv Mater 22:E135–E138. https://doi.org/10.1002/adma.200903528
Manley EF, Strzalka J, Fauvell TJ, Jackson NE, Leonardi MJ, Eastham ND, Marks TJ, Chen LX (2017) In situ GIWAXS analysis of solvent and additive effects on PTB7 thin film microstructure evolution during spin coating. Adv Mater 29:1703933. https://doi.org/10.1002/adma.201703933
Myung-Jin B, Lee S, Zong K, Lee Y (2010) Low band gap conjugated polymers consisting of alternating dodecyl thieno[3,4-b]thiophene-2-carboxylate and one or two thiophene rings: synthesis and photovoltaic property. Synth Metals 160:1197–1203. https://doi.org/10.1016/j.synthmet.2010.03.008
Pan H, Zuo L, Fu W, Fan C, Andreasen B, Jiang X, Norrman K, Krebs F, Chen H (2013) MoO3-Au composite interfacial layer for high efficiency and air-stable organic solar cells. Org Electron 14:797–803. https://doi.org/10.1016/j.orgel.2012.12.020
Park S, Roy A, Beaupre S, Cho S, Coates N, Moon J, Moses D, Leclerc M, Lee K, Heeger A (2009) Bulk heterojunction solar cells with internal quantum efficiency approaching 100%. Nat Photonics 3:297–303. https://doi.org/10.1038/nphoton.2009.69
Rastegaralam M, Lee C, Dettlaff-Weglikowska U (2017) Solvent-dependent thermoelectric properties of PTB7 and effect of 1,8-diiodooctane additive. Crystals 7:292. https://doi.org/10.3390/cryst7100292
Roehling J, Baran D, Sit J, Kassar T, Ameri T, Unruh T, Brabec C, Moulé A (2016) Nanoscale morphology of PTB7 based organic photovoltaics as a function of fullerene size. Sci Rep 6:30915. https://doi.org/10.1038/srep30915
Sendova-Vassileva M, Dikov H, Vitanov P, Popkirov G, Gergova R, Grancharov G, Gancheva V (2016) Magnetron sputtered molybdenum oxide for application in polymers solar cells. J Phys Conf Ser 764:012022. https://doi.org/10.1088/1742-6596/764/1/012022
Su Y, Lan S, Wei K (2012) Organic photovoltaics. Mater Today 15:554–562. https://doi.org/10.1016/S1369-7021(13)70013-0
Wang J, Liang Z (2016) Synergetic solvent engineering of film nanomorphology to enhance planar perylene diimide based organic photovoltaics. ACS Appl Mater Interfaces 8:22418–22424. https://doi.org/10.1021/acsami.6b08284
Wang H, Yu X, Yi C, Ren H, Liu C, Yang Y, Xiao S, Zheng J, Karim A, Cheng S, Gong X (2013) Fine-tuning of fluorinated thieno[3,4-b]thiophene copolymer for efficient polymer solar cells. J Phys Chem C 117:4358–4363. https://doi.org/10.1021/jp311031s
Wang L, Zhao S, Xu Z, Zhao J, Huang D, Zhao L (2016) Integrated effects of two additives on the enhanced performance of PTB7:PC71BM polymer solar cells. Materials 9:171. https://doi.org/10.3390/ma9030171
Wienk M, Kroon J, Verhees W, Knol J, Hummelen J, van Hal P, Janssen R (2003) Efficient methano[70]fullerene/MDMO-PPV bulk heterojunction photovoltaic cells. Angew Chem Int Ed 42:3371–3375. https://doi.org/10.1002/anie.200351647
Yao Y, Liang Y, Shrotriya V, Xiao S, Yu L, Yang Y (2007) Plastic near-infrared photodetectors utilizing low band gap polymer. Adv Mater 19:3979–3983. https://doi.org/10.1002/adma.200602670
Zhang G, Fu Y, Zhang Q, Xie Z (2010) Benzo[1,2-b:4,5-b′]dithiophene-dioxopyrrolothiophen copolymers for high performance solar cells. Chem Commun 46:4997–4999. https://doi.org/10.1039/c0cc00098a
Zheng Y, Goh T, Fan P, Shi W, Yu J, Taylor A (2016) Towards efficient thick active PTB7 photovoltaic layers using diphenyl ether as a solvent additive. ACS Appl Mater Interfaces 8:15724–15731. https://doi.org/10.1021/acsami.6b03453
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The authors are grateful to the Bulgarian National Science Fund and project DFNI-E02/5-12/12/2014 for the financial support.
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Grancharov, G., Gancheva, V., Petrov, P. et al. Optical, film surface and photovoltaic properties of PTB7-Fx-based polymer-organic solar cells prepared in ambient conditions. Chem. Pap. 72, 1669–1676 (2018). https://doi.org/10.1007/s11696-018-0446-2
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DOI: https://doi.org/10.1007/s11696-018-0446-2