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Journal articleTsoi WC, Spencer SJ, Yang L, et al., 2011,
Effect of Crystallization on the Electronic Energy Levels and Thin Film Morphology of P3HT:PCBM Blends
, MACROMOLECULES, Vol: 44, Pages: 2944-2952, ISSN: 0024-9297- Author Web Link
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- Citations: 220
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Journal articleMaurano A, Shuttle CC, Hamilton R, et al., 2011,
Transient Optoelectronic Analysis of Charge Carrier Losses in a Selenophene/Fullerene Blend Solar Cell
, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 115, Pages: 5947-5957, ISSN: 1932-7447- Author Web Link
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- Citations: 152
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Journal articleKirchartz T, Pieters BE, Kirkpatrick J, et al., 2011,
Recombination via tail states in polythiophene: fullerene solar cells
, PHYSICAL REVIEW B, Vol: 83, ISSN: 1098-0121- Author Web Link
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- Citations: 325
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Journal articleVoigt MM, Mackenzie RCI, Yau CP, et al., 2011,
Gravure printing for three subsequent solar cell layers of inverted structures on flexible substrates
, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 95, Pages: 731-734, ISSN: 0927-0248- Author Web Link
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- Citations: 95
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Journal articleFaist MA, Keivanidis PE, Foster S, et al., 2011,
Effect of Multiple Adduct Fullerenes on Charge Generation and Transport in Photovoltaic Blends with Poly(3-hexylthiophene-2,5-diyl)
, JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, Vol: 49, Pages: 45-51, ISSN: 0887-6266- Author Web Link
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- Citations: 56
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Journal articleBall JM, Bouwer RKM, Kooistra FB, et al., 2011,
Soluble fullerene derivatives: The effect of electronic structure on transistor performance and air stability
, Journal of Applied Physics, Vol: 110, Pages: 014506-014506 -
Journal articleSoon YW, Clarke TM, Zhang W, et al., 2011,
Energy versus electron transfer in organic solar cells: a comparison of the photophysics of two indenofluorene: fullerene blend films
, Chemical Science, Vol: 2, Pages: 1111-1120, ISSN: 2041-6520In this paper, we compare the photophysics and photovoltaic device performance of two indenofluorene based polymers: poly[2,8-(6,6,12,12-tetraoctylindenofluorene)-co-4,7-(2,1,3-benzothiodiazole] (IF8BT) and poly[2,8-(6,6,12,12-tetraoctylindenofluorene)-co-5,5-(4[prime or minute],7[prime or minute]-di-2-thienyl-2[prime or minute],1[prime or minute],3[prime or minute]-benzothiodiazole] (IF8TBTT) blended with [6,6]-phenyl C61 butyric acid methyl ester (PCBM). Photovoltaic devices made with IF8TBTT exhibit greatly superior photocurrent generation and photovoltaic efficiency compared to those made with IF8BT. The poor device efficiency of IF8BT/PCBM devices is shown to result from efficient, ultrafast singlet Forster energy transfer from IF8BT to PCBM, with the resultant PCBM singlet exciton lacking sufficient energy to drive charge photogeneration. The higher photocurrent generation observed for IF8TBTT/PCBM devices is shown to result from IF8TBTT's relatively weak, red-shifted photoluminescence characteristics, which switches off the polymer to fullerene singlet energy transfer pathway. As a consequence, IF8TBTT singlet excitons are able to drive charge separation at the polymer/fullerene interface, resulting in efficient photocurrent generation. These results are discussed in terms of the impact of donor/acceptor energy transfer upon photophysics and energetics of charge photogeneration in organic photovoltaic devices. The relevance of these results to the design of polymers for organic photovoltaic applications is also discussed, particularly with regard to explaining why highly luminescent polymers developed for organic light emitting diode applications often give relatively poor performance in organic photovoltaic devices.
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Journal articleBrabec CJ, Heeney M, McCulloch I, et al., 2011,
Influence of blend microstructure on bulk heterojunction organic photovoltaic performance
, CHEMICAL SOCIETY REVIEWS, Vol: 40, Pages: 1185-1199, ISSN: 0306-0012- Author Web Link
- Open Access Link
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- Citations: 483
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Journal articleClarke TM, Ballantyne A, Shoaee S, et al., 2010,
Analysis of Charge Photogeneration as a Key Determinant of Photocurrent Density in Polymer: Fullerene Solar Cells
, Adv. Mater., Vol: 22, Pages: 5287-5291, ISSN: 1521-4095 -
Journal articleKeivanidis PE, Kamm V, Dyer-Smith C, et al., 2010,
Delayed Luminescence Spectroscopy of Organic Photovoltaic Binary Blend Films: Probing the Emissive Non-geminate Charge Recombination
, ADVANCED MATERIALS, Vol: 22, Pages: 5183-+, ISSN: 0935-9648- Author Web Link
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- Citations: 24
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Journal articleMaurano A, Hamilton R, Shuttle CG, et al., 2010,
Recombination Dynamics as a Key Determinant of Open Circuit Voltage in Organic Bulk Heterojunction Solar Cells: A Comparison of Four Different Donor Polymers
, ADVANCED MATERIALS, Vol: 22, Pages: 4987-+, ISSN: 0935-9648- Author Web Link
- Open Access Link
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- Citations: 348
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Journal articleJamieson FC, Agostinelli T, Azimi H, et al., 2010,
Field-Independent Charge Photogeneration in PCPDTBT/PC70BM Solar Cells
, The Journal of Physical Chemistry Letters, Vol: 1, Pages: 3306-3310, ISSN: 1948-7185 -
Journal articleShuttle CG, Hamilton R, O'Regan BC, et al., 2010,
Charge-density-based analysis of the current-voltage response of polythiophene/fullerene photovoltaic devices
, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 107, Pages: 16448-16452, ISSN: 0027-8424- Author Web Link
- Open Access Link
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- Citations: 246
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Journal articleDyer-Smith C, Reynolds LX, Bruno A, et al., 2010,
Triplet Formation in Fullerene Multi-Adduct Blends for Organic Solar Cells and Its Influence on Device Performance
, ADVANCED FUNCTIONAL MATERIALS, Vol: 20, Pages: 2701-2708, ISSN: 1616-301X- Author Web Link
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- Citations: 45
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Journal articleSaid AJ, Poize G, Martini C, et al., 2010,
Hybrid Bulk Heterojunction Solar Cells Based on P3HT and Porphyrin-Modified ZnO Nanorods
, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 114, Pages: 11273-11278, ISSN: 1932-7447- Author Web Link
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- Citations: 95
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Journal articleClarke TM, Ballantyne AM, Tierney S, et al., 2010,
Charge Photogeneration in Low Band Gap Polyselenophene/Fullerene Blend Films
, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 114, Pages: 8068-8075, ISSN: 1932-7447- Author Web Link
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- Citations: 58
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Journal articleHamilton R, Shuttle CG, O'Regan B, et al., 2010,
Recombination in Annealed and Nonannealed Polythiophene/Fullerene Solar Cells: Transient Photovoltage Studies versus Numerical Modeling
, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 1, Pages: 1432-1436, ISSN: 1948-7185- Author Web Link
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- Citations: 142
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Journal articleHorie M, Shen I-W, Tuladhar SM, et al., 2010,
Poly(thienylenevinylene) prepared by ring-opening metathesis polymerization: Performance as a donor in bulk heterojunction organic photovoltaic devices
, POLYMER, Vol: 51, Pages: 1541-1547, ISSN: 0032-3861- Author Web Link
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- Citations: 23
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Journal articleHaque SA, Nelson J, 2010,
Toward Organic All-Optical Switching
, SCIENCE, Vol: 327, Pages: 1466-1467, ISSN: 0036-8075- Author Web Link
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- Citations: 52
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Journal articleShuttle CG, Hamilton R, Nelson J, et al., 2010,
Measurement of Charge-Density Dependence of Carrier Mobility in an Organic Semiconductor Blend
, ADVANCED FUNCTIONAL MATERIALS, Vol: 20, Pages: 698-702, ISSN: 1616-301X- Author Web Link
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- Citations: 147
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Journal articleWoebkenberg PH, Ishwara T, Nelson J, et al., 2010,
TiO<sub>2</sub> thin-film transistors fabricated by spray pyrolysis
, APPLIED PHYSICS LETTERS, Vol: 96, ISSN: 0003-6951- Author Web Link
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- Citations: 51
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Journal articleAtienzar P, Ishwara T, Illy BN, et al., 2010,
Control of Photocurrent Generation in Polymer/ZnO Nanorod Solar Cells by Using a Solution-Processed TiO<sub>2</sub> Overlayer
, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 1, Pages: 708-713, ISSN: 1948-7185- Author Web Link
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- Citations: 62
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Journal articleKeivanidis PE, Clarke TM, Lilliu S, et al., 2010,
Dependence of Charge Separation Efficiency on Film Microstructure in Poly(3-hexylthiophene-2,5-diyl): [6,6]-Phenyl-C<sub>61</sub> Butyric Acid Methyl Ester Blend Films
, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 1, Pages: 734-738, ISSN: 1948-7185- Author Web Link
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- Citations: 98
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Journal articleBallantyne AM, Ferenczi TAM, Campoy-Quiles M, et al., 2010,
Understanding the Influence of Morphology on Poly(3-hexylselenothiophene):PCBM Solar Cells
, MACROMOLECULES, Vol: 43, Pages: 1169-1174, ISSN: 0024-9297- Author Web Link
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- Citations: 86
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Book chapterBrabec CJ, Mcculloch I, Nelson J, 2010,
Determination and Control of Microstructure in Organic Photovoltaic Devices
, Functional Supramolecular Architectures: For Organic Electronics and Nanotechnology, Pages: 827-860 -
Book chapterKim Y, Cook S, Tuladhar SM, et al., 2010,
A strong regioregularity effect in self-organizing conjugated polymer films and high-efficiency polythiophene: Fullerene solar cells
, Materials for Sustainable Energy: A Collection of Peer-Reviewed Research and Review Articles from Nature Publishing Group, Pages: 63-69Low-cost photovoltaic energy conversion using conjugated molecular materials has become increasingly feasible through the development of organic ‘bulk heterojunction (BHJ)’ structures1−7, where efficient light-induced charge separation is enabled by a large-area donor–acceptor interface2,3. The highest efficiencies have been achieved using blends of poly(3-hexylthiophene) (P3HT) and a fullerene derivative8–12, but performance depends critically on the material properties and processing conditions. This variability is believed to be influenced by the self-organizing properties of P3HT, which means that both optical13,14and electronic15,16properties are sensitive to the molecular packing. However, the relationship between molecular nanostructure, optoelectronic properties of the blend material and device performance has not yet been demonstrated. Here we focus on the influence of polymer regioregularity (RR) on the molecular nanostructure, and hence on the resulting material properties and device performance.We find a strong influence of RR on solar-cell performance, which can be attributed to enhanced optical absorption and transport resulting from the organization of P3HT chains and domains. Further optimization of devices using the highest RR material resulted in a power conversion efficiency of 4.4%, even without optimization of electrodes7.
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Journal articleMacKenzie RCI, Frost JM, Nelson J, 2010,
A numerical study of mobility in thin films of fullerene derivatives
, The Journal of chemical physics, Vol: 132, Pages: 064904-064904 -
Journal articleFrost JM, Faist MA, Nelson J, 2010,
Energetic disorder in higher fullerene adducts: A quantum chemical and voltammetric study
, Advanced Materials, Vol: 22, Pages: 4881-4884 -
Journal articleSvanstrom CMB, Rysz J, Bernasik A, et al., 2009,
Device Performance of APFO-3/PCBM Solar Cells with Controlled Morphology
, ADVANCED MATERIALS, Vol: 21, Pages: 4398-+, ISSN: 0935-9648- Author Web Link
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- Citations: 50
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Journal articleKrebs FC, Gevorgyan SA, Gholamkhass B, et al., 2009,
A round robin study of flexible large-area roll-to-roll processed polymer solar cell modules
, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 93, Pages: 1968-1977, ISSN: 0927-0248- Author Web Link
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- Citations: 190
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