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Department of Physics and Astronomy Collins Research Group


 Google Scholar Citations


  • “Comparison of the Device Performance and Optoelectronics of a Small Molecule Donor versus a Polymer Donor Blend with Non-Fullerene Acceptor.” E. Sağlamkaya, M.S. Shadabroo, N. Tokmoldin, T.M. Melody, B. Sun, O. Alqahtani, A. Patterson, B.A. Collins, D. Neher, S. Shoaee, Submitted.
  • “Film-forming kinetics modulate the vertical structure of active layers for efficient sequential blade-coating organic solar cells.” Y. Wang, Y. Tang, Y. Ouyang, W. Wu, A. Patterson, O. Alqahtani, T. Melody, K. Zhou, G. Lu, J. Min, C. Zhang, H. Yan, Q. Fan, L. Jiang, B. A. Collins, W. Ma, Submitted.
  • “Illuminating the dark side of triplet state and its role on Voc in PM6:o-IDTBR solar cells” M. S. Shadabroo, N. Tokmoldin, D. Sun, A. Patterson, T. M. Melody, O. Alqahtani, B. A. Collins, D. Neher, S. Shoaee, Submitted.
  • “Local chemical enhancement and gating of organic mixed ionic-electronic transport” T. Khan, T. McAfee, T. Ferron, A. Alotaibi, B. A. Collins, Submitted.
  • “Probing charge recombination in organic solar cells” A. C. Hurd, A. Alotaibi, A. Patterson, O. Alqahtani, J. Doyle, B. A. Collins, Macalester Journal of Physics and Astronomy 12, 9, (2024).
  • “Molecular weight-independent “polysoap” nanostructure characterized via in-situ resonant soft X-ray scattering” D. Grabner, P. D. Pickett, T. McAfee, B. A. Collins, Langmuir (2024) DOI: 10.1021/acs.langmuir.3c03897


  • “Green Additive Limits Runaway Crystallinity in PM6:Y6 Organic Solar Cells but Causes Field Independent Geminate Recombination” O. Alqahtani, A. Alotaibi, M. Burnes, B. A. Collins, ACS Energy Letters (2023) DOI: 10.1021/acsenergylett.3c01604.
  • “Toward more efficient organic solar cells: a detailed study of loss pathway and its impact on overall device performance in low-offset organic solar cells” B. Sun, N. Tokmoldin, O. Alqahtani, A. Patterson, C. S. P. De Castro, D. B. Riley, M. Pranav, A. Armin, F. Laquai, B. A. Collins, D. Neher, S. Shoaee, Advanced Energy Materials (2023) DOI: 10.1002/aenm.202300980 
  • “Elucidating How Low Energy Offset Matters to Performance of Nonfullerene Acceptor-Based Solar Cells” N. Tokmoldin, B. Sun, F. Moruzzi, A. Patterson, O. Alqahtani, R. Wang, B. A. Collins, I. McCulloch, L. Lüer, C. J. Brabec, D. Neher, S. Shoaee, ACS Energy Letters (2023). DOI: 10.1021/acsenergylett.3c00572


  • “Solvent induced polymorphism in non-fullerene based organic solar cells” J. Xin, H, Zhao, J. Xue, S. Seibt, B. A. Collins, W. Ma, Solar RRL (2022). DOI:10.1002/solr.202200819  
  • “Electrical edge effect induced photocurrent overestimation in low-light organic photovoltaics” X. Zhou, C. Zhao, A. N. Alotaibi, H. Wu, H. B. Naveed, B. Lin, K. Zhou, Z. Ma, B. A. Collins, W. Ma, Joule (2022). DOI: 10.1016/j.joule.2022.06.008
  • “On the interplay between CT and singlet exciton emission in organic solar cells with small driving force and its impact on voltage loss.” T. Fritsch, J. Kurpiers, S. Roland, N. Tokmoldin, S. Shoeaee, T. Ferron, B. A. Collins, S. Janietz, K. Vandewal, D. Neher, Advanced Energy Materials (2022). DOI: 10.1002/aenm.202200641
  • “High sensitivity of non-fullerene organic solar cells morphology and performance to a processing additive.” O. Alqahtani, J. Lv, T. Xu, V. Murcia, T. Ferron, T. McAfee, D. Grabner, T. Duan, B. A. Collins, Small (2022) DOI: 10.1002/smll.202202411



  • “Molecular and Energetic Order Dominate the Photocurrent Generation Process in Organic Solar Cells with Small Energetic Offsets” K. Zhou, Y. Liu, A. Alotaibi, J. Yuan, C. Jiang, J. Xin, X. Liu, B. A. Collins, F. Zhang, W. Ma,  ACS Energy Letters, 5, 589-596 (2020).
  • “Absolute intensity calibration for carbon-edge soft X-ray scattering” T. Ferron, D. Grabner, T. McAfee, B. A. Collins, Journal of Synchrotron Radiation, 27, 1601-1608 (2020).
  • “GIWAXS-SIIRkit: scattering intensity, indexing and refraction calculation toolkit for grazing-incidence wide-angle X-ray scattering of organic materials” V. SavikhinH.-G. SteinrückR.-Z. LiangB. A. CollinsS. D. OosterhoutP. M. Beaujuge, M. F. Toney, Journal of Applied Crystallography, 53,1108-1129 (2020).



  • “Probing the Pathways of Free Charge Generation in Organic Bulk Heterojunction Solar Cells.” J. Kurpiers, T. Ferron, S. Roland, M. Jakoby, T. Thiede, F. Jaiser, S. Albrecht, S. Janietz, B. A. Collins, I. Howard, and D. Neher,  Nature Communications, 9, 2038 (2018).
  • “Mixed domains enhance charge generation and extraction in bulk-heterojunction solar cells with small-molecule donors.” O. Alqahtani, M. Babics, J. Gorenflot, V. Savikhin, T. Ferron, A. H. Balawi, A. Paulke, Z. Kan, M. Pope, A. J. Clulow, J. Wolf, P. L. Burn, I. R. Gentle, D. Neher, M. F. Toney, F. Laquai, P. M. Beaujuge, B. A. Collins,  Advanced Energy Materials, 8, 1702941 (2018).
  • “Quantitative relations between interaction parameter, miscibility, and function in organic solar cells.” L. Ye, H. Hu, M. Ghasemi, T. Wang, B. A. Collins, J. Kim, K. Jiang, J. Carpenter, H. Li, Z. Li, T. McAfee, J. Zhao, X. Chen, J. Lai, T. Ma, J. Bredas, H. Yan, H. Ade,  Nature Materials, 17, 253 (2018).
  • “Miscibility-function relations in organic solar cells: Significance of optimal miscibility in relation to percolation.” L. Ye, B. A. Collins, X. Jiao, J. Zhao, H. Yan, H. Ade,  Advanced Energy Materials, 8, 1703058 (2018).


  • “Spectral analysis for resonant soft X-ray scattering enables measurement of interfacial width in 3D organic nanostructures.” T. Ferron, M. Pope, B. A. Collins,  Physical Review Letters, 119, 167801 (2017).
  • “Connecting molecular conformation to aggregation in P3HT using near-edge X-ray absorption fine structure spectroscopy.” S. G. Urqhardt, M. Martinson, S. Eger, V. Murcia, H. Ade, B. A. Collins,  The Journal of Physical Chemistry C, 121, 21720 (2017).
  • “In situ X-ray scattering studies of the influence of an additive on the formation of a low-bandgap bulk heterojunction.” F. A. Bokel, S. Engmann, A. A. Herzing, B. A. Collins, H. W. Ro, D. M. DeLongchamp, L. J. Richter, E. Schaible, A. Hexemer,  Chemistry of Materials, 29, 2283 (2017).


  • “Structural control of mixed ionic and electronic transport in conducting polymers.” J. Rivnay, S. Inal, B. A. Collins, M. Sessolo, E. Stavrinidou, X. Strakosas, C. Tassone, D. M. Delongchamp, G. G. Malliaras,  Nature Communications, 7, 11287 (2016).


  • “Morphological origins of polarization-induced scattering anisotropy from organic thin films.” E. Gann, B. A. Collins, M. Tang, J. R. Tumbleston, S. Mukherjee, H. Ade,  Journal of Synchrotron Radiation, 23, 219 (2015).
  • “Structural and chemical ordering of Heusler Co_xMn_yGe_z epitaxial film son Ge(111) – quantitative study using traditional and anomalous x-ray diffraction techniques.” B. A. Collins, Y. S. Chu, L. He, D. Haskel, F. Tsui,  Physical Review B, 92, 224108 (2015).


  • Chapter: “Organic Photovoltaic Morphology” B. A. Collins, F. A. Bockel, D. M. Delongchamp, in Organic Photovoltaic Devices, Christoph Brabec Ed., STM-Books (Wiley) 2014.
  • “Fullerene-free polymer solar cells with highly reduced bimolecular recombination and field-independent charge carrier generation.” S. Roland, M. Schubert, B. A. Collins, J. Kurpiers, Z. H. Chen, A. Facchetti, H. Ade, D. Neher,  Journal of Physical Chemistry Letters, 5, 2815 (2014).
  • “Correlated Donor/Acceptor Crystal Orientation and Fast Charge-Transfer State Recombination Controls Photocurrent Generation in All-Polymer Solar Cells.” M. Schubert, B. A. Collins, H. Mangold, I. A. Howard, W. Schindler, K. Vandewal, S. Rloand, J. Behrends, F. Kraffert, R. Steyrleuthner, Z. Chen, K Fostiropouulos, R. Bittl, A. Salleo, A. Facchetti, F. Laquai, H. Ade, D. Neher,  Advanced Functional Materials, 24, 4068 (2014).
  • “The role of regioregularity and crystallinity on electron transport anisotropy in a high mobility n-type copolymer.” R. Steyrleuthner, R. Di Pietro, B. A. Collins, F. Polzer, S. Himmelberger, H. Kirmse, M. Schubert, Z. Chen, A. Salleo, H. Ade, A. Facchetti, D. Neher,   Journal of the American Chemical Society, 136, 4245 (2014).
  • “The influence of molecular orientation on organic bulk heterojunction solar cells.” J. R. Tumbleston, B. A. Collins, L. Yang, A. C. Stuart, E. Gann, W. Ma, W. You, H. Ade,  Nature Photonics, 8, 385 (2014).


  • “Modifications in morphology resulting from nanoimprinting bulk heterojunction blends for light trapping organic solar cell designs.” J. R. Tumbleston, A. D. Gadisa, Y. Liu, B. A. Collins, E. T. Samulski, R. Lopez, H. Ade,  ACS Applied Materials and Interfaces, 5, 8225 (2013).
  • “The importance of fullerene percolation in the mixed regions of polymer-fullerene bulk heterojunction solar cells.” J. A. Bartelt, Z. M. Beiley, E. T. Hoke, W. R. Mateker, J. D. Douglas, B. A. Collins, J. R. Tumbleston, K. R. Graham, A. Amassian, H. Ade, J. M. J. Fréchet, M. F. Toney, M. D. McGehee,  Advanced Energy Materials, 3, 364 (2013).
  • “Synthesis, solid-state, and charge-transport properties of conjugated polythiophene-S,S-dioxides.” J. E. Cochran, E. Amir, K. Sivanandan, S.-Y., Ku, J. H. Seo, B. A. Collins, J. R. Tumbleston, M. F. Toney, H. Ade, C. J. Hawker, M. L. Chabinyc,  Journal of Polymer Science B, 51, 48 (2013).
  • “Absolute measurement of domain composition and nanoscale size distribution explains performance in PTB7:PC71BM solar cells.” B. A. Collins, Z. Li, J. R. Tumbleston, E. Gann, C. R. McNeill, H. Ade,  Advanced Energy Materials, 3, 65 (2013). [Feature Article]


  • “Quantitative compositional analysis of organic thin films using transmission NEXAFS spectroscopy in an x-ray microscope.” B. A. Collins, H. Ade,  Journal of Electron Spectroscopy, 85, 119 (2012).
  • “Soft x-ray scattering facility at the Advanced Light Source with real-time data processing and analysis.” E. Gann, A. Young, B. A. Collins, H. Yan, J. Nasiatka, H. A. Padmore, H. Ade, A. Hexemer, C. Wang,  Review of Scientific Instruments, 83, 045110 (2012).
  • “Polarized x-ray scattering reveals noncrystalline orientational ordering in organic films.” B. A. Collins, J. Cochran, H. Yan, E. Gann, C. Hub, R. Fink, C. Wang, T. Schuettfort, C. R. McNeill, M. L. Chabinyc, H. Ade,  Nature Materials, 11, 536 (2012). [Selected for Nature Materials “News and Views”]
  • “Studying polymer/fullerene interdiffusion and miscibility in laterally-patterned films with x-ray spectromiscroscopy.” X. He, B. A. Collins, B. Watts, H. Ade, C. R. McNeill,  Small, 8, 1920 (2012).
  • “Correlating the efficiency and nanomorphology of polymer blend solar cells utilizing resonant soft x-ray scattering.” H. Yan, B. A. Collins, E. Gann, C. Wang, H. Ade, C. R. McNeill,  ACS Nano, 6, 677 (2012).