Publications

Dynamic nanodomains dictate macroscopic properties in lead halide perovskites

M. Dubajic et al.

Nature Nanotechnol (2025)

• Perovskites

Pathways, Probes, and Puzzles of Broadband Luminescence in “Perovskite-Inspired” Materials

S. Kahmann

ACS Mater. Lett, 7, 1732 (2025)

• Perovskites
• Spectroscopy and photophysics

DOI: 10.1021/acsmaterialslett.5c00274

Photoluminescence microscopy of optoelectronic materials

Z. Wei, M. Dubajic, C. Chosy, S. Kahmann, S. D. Stranks

Nature Reviews Methods Primers, 5, 37 (2025)

• Spectroscopy and photophysics

Picosecond quantum transients in halide perovskite nanodomain superlattices

D. Guo, T. A. Selby, S. Kahmann, S. Gorgon, L. Dai, M. Dubajic, T. C.-J. Yang, S. M. Fairclough, T. Marsh, I. E. Jacobs, B. Wu, R. Guo, S. Nagane, T. A. S. Doherty, K. Ji, C. Liu, Y. Lu, T. Kang, C. Mamak, J. Mao, P. Müller-Buschbaum, H. Sirringhaus, P. A. Midgley, S. D. Stranks

Nature Nanotechnol (2025)

• Perovskites

Resonant Cavity Effect for Spectrally Tunable and Efficient Narrowband Perovskite Photodetectors

Z. Y. Ooi, S. Nie, G. Vega, M. C. Lai, A. Jiménez-Solano, C.-S. Huang, H. Wang, T. Liu, K. Gałkowski, M. P. Nowak, P. Nyga, Q. Cheng, C. Ducati, S. Carretero-Palacios, S. Kahmann, S. D. Stranks, M. Anaya

ACS Photonics (2025)

• Optoelectronic devices
• Perovskites

DOI: 10.1021/acsphotonics.4c01942

A Practical Approach Toward Highly Reproducible and High-Quality Perovskite Films Based on an Aging Treatment

Y. Zou, X. Bai, S. Kahmann, L. Dai, S. Yuan, S. Yin, J. E. Heger, M. Schwartzkopf, S. V. Roth, C.-C. Chen, J. Zhang, S. D. Stranks, R. H. Friend, and P. Müller-Buschbaum

Adv. Mater, 36, 2307024 (2024)

• Perovskites

DOI: 10.1002/adma.202307024

Effects of local compositional heterogeneity in mixed halide perovskites on blue electroluminescence

X. Luo, W. Xu, G. Zheng, S. Tammireddy, Q. Wei, M. Karlsson, Z. Zhang, K. Ji, S. Kahmann, C. Yin, Y. Zou, Z. Zhang, H. Chen, L. Marcal, H. Zhao, D. Ma, D. Zhang, Y. Lu, M. Li, C. Deibel, S. D. Stranks, L. Duan, J. Wallentin, W. Huang, F. Gao

Matter, 7, 1 (2024)

• Optoelectronic devices
• Perovskites
• Spectroscopy and photophysics

Strong angular and spectral narrowing of electroluminescence in an integrated Tamm-plasmon-driven halide perovskite LED

Z. Y. Ooi, A. Jiménez-Solano, K. Gałkowski, Y. Sun, J. Ferrer Orri, K. Frohna, H. Salway, S. Kahmann, S. Nie, G. Vega, S. Kar, M. P. Nowak, S. Maćkowski, P. Nyga, C. Ducati, N. C. Greenham, B. V. Lotsch, M. Anaya, S. D. Stranks

Nature Commun, 15, 5802 (2024)

• Optoelectronic devices
• Perovskites
• Spectroscopy and photophysics

Imaging light-induced migration of dislocations in halide perovskites with 3d nanoscale strain mapping

K. W. P. Orr, J. Diao, M. N. Lintangpradipto, D. J. Batey, A. N. Iqbal, S. Kahmann, K. Frohna, M. Dubajic, S. J. Zelewski, A. E. Dearle, T. A. Selby, P. Li, T. A. S. Doherty, S. Hofmann, O. M. Bakr, I. K. Robinson, S. D. Stranks

Adv. Mater, 35, 2305549 (2023)

• Perovskites

DOI: 10.1002/adma.202305549

Tuning the energy transfer in Ruddlesden–Popper perovskites phases through isopropylammonium addition–towards efficient blue emitters

M. J. Rivera Medina, L. Di Mario, S. Kahmann, J. Xi, G. Portale, G. Bongiovanni, A. Mura, J. C. Alonso Huitrón, M. A. Loi

Nanoscale, 15, 6673 (2023)

• Perovskites

Unraveling the Broadband Emission in mixed Tin-Lead Layered Perovskites

H.-H. Fang, E. K. Tekelenburg, H. Xue, S. Kahmann, L. Chen, S. Adjokatse, G. Brocks, S. Tao, M. A. Loi

Adv. Opt. Mater, 11, 2202038 (2023)

• Perovskites
• Spectroscopy and photophysics

DOI: 10.1002/adom.202202038

Compositional Variation in FAPb1-xSnxI3 and Its Impact on the Electronic Structure: A Combined Density Functional Theory and Experimental Study

S. Kahmann, Z. Chen, O. Hordiichuk, O. Nazarenko, S. Shao, M. V. Kovalenko, G. R. Blake, S. Tao, M. A. Loi

ACS Appl. Mater. Interfaces, 14, 34253 (2022)

Efficient vertical charge transport in polycrystalline halide perovskites revealed by four-dimensional tracking of charge carriers

C. Cho, S. Feldmann, K. M. Yeom, Y.-W. Jang, S. Kahmann, J.-Y. Huang, T. C.-J. Yang, M. N. T. Khayyat, Y.-R. Wu, M. Choi, J. H. Noh, S. D. Stranks, N. C. Greenham

Nature Materials, 21, 1388 (2022)

• Optoelectronic devices
• Perovskites
• Spectroscopy and photophysics

Heterostructure from PbS Quantum Dot and Carbon Nanotube Inks for High-Efficiency Near-Infrared Light-Emitting Field-Effect Transistors

D. Bederak, A. Shulga, S. Kahmann, W. Talsma, J. Pelanskis, D. N. Dirin, M. V. Kovalenko, M. A. Loi

Adv. Electron. Mater, 2101126 (2022)

• Optoelectronic devices
• Organic semiconductors
• Quantum dots

Taking a closer look how the microstructure of Dion-Jacobson perovskites governs their photophysics

S. Kahmann, H. Duim, A. J. Rommens, K. Frohna, G. H. ten Bring, G. Portale, S. D. Stranks, M. A. Loi

J. Mater. Chem. C, 10, 17539 (2022)

• Perovskites
• Spectroscopy and photophysics

The origin of broad emission in <100> two-dimensional perovskites: Extrinsic vs. intrinsic processes

S. Kahmann, D. Meggiolaro, L. Gregori, E. K. Tekelenburg, M. Pitaro, S. D. Stranks, F. De Angelis, M. A. Loi

ACS Energy Letters, 7, 4232 (2022)

• Perovskites
• Spectroscopy and photophysics

Tunable multiband halide perovskite tandem photodetectors with switchable response

O. D. I. Moseley, B. Roose, S. J. Zelewski, S. Kahmann, K. Dey, S. D. Stranks

ACS Photonics, 9, 3958 (2022)

• Optoelectronic devices
• Perovskites

Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells

J. Warby, F. Zu, S. Zeiske, E. Gutierrez-Partida, L. Frohloff, S. Kahmann, K. Frohna, E. Mosconi, E. Radicchi, F. Lang, S. Shah, F. Peña-Camargo, H. Hempel, T. Unold, N. Koch, A. Armin, F. De Angelis, S. D. Stranks, D. Neher, M. Stolterfoht

Adv. Energy Mater, 12, 2103567 (2022)

• Optoelectronic devices
• Perovskites

Elucidating the Structure and Photophysics of Layered Perovskites through Cation Fluorination

E. K. Tekelenburg, S. Kahmann, M. E. Kamminga, G. R. Blake, M. A. Loi

Adv. Opt. Mater, 9, 2001647 (2021)

• Perovskites
• Spectroscopy and photophysics

Field-Effect Transistors Based on Formamidinium Tin Triiodide Perovskite

S. Shao, W. Talsma, M. Pitaro, J. Dong, S. Kahmann, A. J. Rommens, G. Portale, M. A. Loi

Adv. Funct. Mater, 31, 2008478 (2021)

• Optoelectronic devices
• Perovskites

Fundamentals of tin iodide perovskites: a promising route to highly efficient, lead-free solar cells

A. Filippetti, S. Kahmann, C. Caddeo, A. Mattoni, M. Saba, A. Bosin, M. A. Loi

J. Mater. Chem. A, 9, 11812 (2021)

• Optoelectronic devices
• Perovskites

Grain-Specific Transitions Determine the Band Edge Luminescence in Dion–Jacobson Type 2D Perovskites

S. Kahmann, H. Duim, A. J. Rommens, E. K. Tekelenburg, S. Shao, M. A. Loi

Adv. Opt. Mater, 9, 2100892 (2021)

• Perovskites
• Spectroscopy and photophysics

Influence of the stoichiometry of tin-based 2D/3D perovskite active layers on solar cell performance

S. Shao, M. Nijenhuis, J. Dong, S. Kahmann, G. H. ten Brink, G. Portale, M. A. Loi

J. Mater. Chem. A, 9, 10095 (2021)

• Optoelectronic devices
• Perovskites

Molecular Doping Directed by a Neutral Radical

J. Liu, B. Van der Zee, D. R. Villava, G. Ye, S. Kahmann, M. Kamperman, J. Dong, L. Qiu, G. Portale, M. A. Loi, J. C. Hummelen, R. C. Chiechi, D. Baran, L. J. A. Koster

ACS Appl. Mater. Interfaces, 13, 29858 (2021)

Photophysics of Two-Dimensional Perovskites – Learning from Metal Halide Substitution

S. Kahmann, H. Duim, H.-H. Fang, M. Dyksik, S. Adjokatse, M. Rivera Medina, M. Pitaro, P. Plochocka, M. A. Loi

Adv. Funct. Mater, 31, 2103778 (2021)

• Perovskites
• Spectroscopy and photophysics

Extrinsic nature of the broad photoluminescence in lead iodide-based Ruddlesden-Popper perovskites

S. Kahmann, E. K. Tekelenburg, H. Duim, M. E. Kamminga, M. A. Loi

Nature Commun, 11, 2344 (2020)

• Perovskites
• Spectroscopy and photophysics

Influence of morphology on photoluminescence properties of methylammonium lead tribromide films

I. van de Riet, H.-H. Fang, S. Adjokatse, S. Kahmann, M. A. Loi

J. Lumin, 220, 117033 (2020)

• Spectroscopy and photophysics

Mechanism of Crystal Formation in Ruddlesden-Popper Sn-Based Perovskites

J. Dong, S. Shao, S. Kahmann, A. J. Rommens, D. Hermida-Merino, G. H. ten Brink, M. A. Loi, G. Portale

Adv. Funct. Mater, 30, 2001294 (2020)

• Perovskites

Negative Thermal Quenching in FASnI3 Perovskite Single Crystals and Thin Films

S. Kahmann, O. Nazarenko, S. Shao, O. Hordiichuk, M. Kepenekian, J. Even, M. V. Kovalenko, G. R. Blake, M. A. Loi

ACS Energy Lett, 5, 2512 (2020)

• Perovskites

On the Colloidal Stability of PbS Quantum Dots Capped with Methylammonium Lead Iodide Ligands

D. Bederak, N. Sukharevska, S. Kahmann, M. Abdu-Aguye, H. Duim, D. N. Dirin, M. V. Kovalenko, G. Portale, M. A. Loi

ACS Appl. Mater. Interfaces, 12, 52959 (2020)

• Quantum dots

Photochromism in Ruddlesden-Popper copper-based perovskites: a light-induced change of coordination number at the surface

B. G. H. M. Groeneveld, H. Duim, S. Kahmann, O. De Luca, E. K. Tekelenburg, M. E. Kamminga, L. Protesescu, G. Portale, G. R. Blake, P. Rudolf, M. A. Loi

J. Mater. Chem. C, 8, 15377 (2020)

• Perovskites

Quantum Dot Light-Emitting Transistors – Powerful Research Tools and Their Future Applications

S. Kahmann, A. Shulga, M. A. Loi

Adv. Funct. Mater, 30, 1904174 (2020)

• Optoelectronic devices
• Quantum dots

The Impact of Stoichiometry on the Photophysical Properties of Ruddlesden-Popper Perovskites

H. Duim, S. Adjokatse, S. Kahmann, G. H. ten Brink, M. A. Loi

Adv. Funct. Mater, 30, 1907505 (2020)

• Perovskites
• Spectroscopy and photophysics

Trap states in lead chalcogenide colloidal quantum dots – origin, impact, and remedies

S. Kahmann, M. A. Loi

Appl. Phys. Rev, 7, 041305 (2020)

• Quantum dots

A multi-objective optimization-based layer-by-layer blade-coating approach for organic solar cells: rational control of vertical stratification for high performance

R. Sun, J. Guo, Q. Wu, Z. Zhang, W. Yang, J. Guo, M. Shi, Y. Zhang, S. Kahmann, L. Ye, X. Jiao, M. A. Loi, Q. Shen, H. Ade, W. Tang, C. J. Brabec, J. Min

Energy Environ. Sci, 12, 3118 (2019)

• Optoelectronic devices
• Organic semiconductors

Absence of Charge Transfer State Enables Very Low VOC Losses in SWCNT:Fullerene Solar Cells

A. Classen, L. Einsiedler, T. Heumueller, A. Graf, M. Brohmann, F. Berger, S. Kahmann, M. Richter, G. J. Matt, K. Forberich, J. Zaumseil, C. J. Brabec

Adv. Energy Mater, 9, 1801913 (2019)

• Optoelectronic devices
• Organic semiconductors

Cooling, Scattering, and Recombination – The Role of the Material Quality for the Physics of Tin Halide Perovskites

S. Kahmann, S. Shao, M. A. Loi

Adv. Funct. Mater, 29, 1902963 (2019)

• Perovskites

Effects of strontium doping on the morphological, structural, and photophysical properties of FASnI3 perovskite thin films

S. Adjokatse, S. Kahmann, H. Duim, M. A. Loi

APL Materials, 7, 031116 (2019)

• Perovskites
• Spectroscopy and photophysics

Favorable Mixing Thermodynamics in Ternary Polymer Blends for Realizing High Efficiency Plastic Solar Cells

N. Gasparini, S. Kahmann, M. Salvador, J. D. Perea, A. Sperlich, A. Baumann, N. Li, S. Rechberger, E. Spiecker, V. Dyakonov, G. Portale, M. A. Loi, C. J. Brabec, T. Ameri

Adv. Energy Mater, 9, 1803394 (2019)

• Optoelectronic devices
• Organic semiconductors

Hot carrier solar cells and the potential of perovskites for breaking the Shockley-Queisser limit

S. Kahmann, M. A. Loi

J. Mater. Chem. C, 7, 2471 (2019)

• Optoelectronic devices
• Perovskites
• Spectroscopy and photophysics

Molecular engineering of organic semiconductors enables noble metal-comparable SERS enhancement and sensitivity

G. Demirel, R. L. M. Gieseking, R. Ozdemir, S. Kahmann, M. A. Loi, G. C. Schatz, A. Facchetti, H. Usta

Nat. Commun, 10, 5502 (2019)

• Organic semiconductors

Photophysical and electronic properties of bismuth-perovskite shelled lead sulfide quantum dots

M. Abdu-Aguye, D. Bederak, S. Kahmann, N. Killilea, M. Sytnyk, W. Heiss, M. A. Loi

J. Chem. Phys, 151, 214702 (2019)

• Optoelectronic devices
• Perovskites
• Quantum dots
• Spectroscopy and photophysics

Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers

S. Kahmann, M. A. Loi, C. J. Brabec

J. Mater. Chem. C, 6, 6008 (2018)

• Organic semiconductors

Donor-acceptor photoexcitation dynamics in organic blends investigated with a high sensitivity pump-probe system

S. Kahmann, W. Gomulya, M. A. Loi, A. Mura

J. Mater. Chem. C, 6, 10822 (2018)

• Organic semiconductors

Electroluminescence Generation in PbS Quantum Dot Light-Emitting Field-Effect Transistors with Solid-State Gating

A. G. Shulga, S. Kahmann, D. N. Dirin, A. Graf, J. Zaumseil, M. V. Kovalenko, M. A. Loi

ACS Nano, 12, 12805 (2018)

• Optoelectronic devices
• Quantum dots
• Spectroscopy and photophysics

Revealing Trap States in Lead Sulphide Colloidal Quantum Dots by Photoinduced Absorption Spectroscopy

S. Kahmann, M. Sytnyk, N. Schrenker, G. J. Matt, E. Spiecker, W. Heiss, C. J. Brabec, M. A. Loi

Adv. Electron. Mater, 4, 1700348 (2018)

• Quantum dots
• Spectroscopy and photophysics

Excited-State Interaction of Semiconducting Single-Walled Carbon Nanotubes with Their Wrapping Polymers

S. Kahmann, J. M. Salazar Rios, M. Zink, S. Allard, U. Scherf, M. C. dos Santos, C. J. Brabec, M. A. Loi

J. Phys. Chem. Lett, 8, 5666 (2017)

• Optoelectronic devices
• Organic semiconductors

Exploring the Limiting Open-Circuit Voltage and the Voltage Loss Mechanism in Planar CH3NH3PbBr3 Perovskite Solar Cells

S. Chen, Y. Hou, H. Chen, M. Richter, F. Guo, S. Kahmann, X. Tang, T. Stubhan, H. Zhang, N. Li, N. Gasparini, C. O. Ramirez Quiroz, L. S. Khanzada, G. J. Matt, A. Osvet, C. J. Brabec

Adv. Energy Mater, 6, 1600132 (2016)

• Optoelectronic devices
• Perovskites

Extending the environmental lifetime of unpackaged perovskite solar cells through interfacial design

H. Chen, Y. Hou, C. E. Halbig, S. Chen, H. Zhang, N. Li, F. Guo, X. Tang, N. Gasparini, I. Levchuk, S. Kahmann, C. O. Ramirez Quiroz, A. Osvet, S. Eigler, C. J. Brabec

J. Mater. Chem. A, 4, 11604 (2016)

• Optoelectronic devices
• Perovskites

Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

X. Tang, M. Brandl, B. May, I. Levchuk, Y. Hou, M. Richter, H. Chen, S. Chen, S. Kahmann, A. Osvet, F. Maier, H.-P. Steinrück, R. Hock, G. J. Matt, C. J. Brabec

J. Mater. Chem. A, 4, 15896 (2016)

• Perovskites

Polarons in Narrow Band Gap Polymers Probed over the Entire Infrared Range: A Joint Experimental and Theoretical Investigation

S. Kahmann, D. Fazzi, G. J. Matt, W. Thiel, M. A. Loi, C. J. Brabec

J. Phys. Chem. Lett, 7, 4438 (2016)

• Organic semiconductors

Optoelectronics of PbS quantum dot and narrow bandgap polymer blends

S. Kahmann, A. Mura, L. Protesescu, M. V. Kovalenko, C. J. Brabec, M. A. Loi

J. Mater. Chem. C, 3, 5499 (2015)

• Organic semiconductors
• Quantum dots

Small molecule bulk heterojunction organic solar cells with coumarin-6 as donor material

B. Beyer, D. Griese, C. Schirrmann, R. Pfeifer, S. Kahmann, O. R. Hild, K. Leo

Thin Solid Films, 536 (2013)

• Optoelectronic devices
• Organic semiconductors