C. Hartmann

1.1k total citations
47 papers, 896 citations indexed

About

C. Hartmann is a scholar working on Condensed Matter Physics, Electrical and Electronic Engineering and Materials Chemistry. According to data from OpenAlex, C. Hartmann has authored 47 papers receiving a total of 896 indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Condensed Matter Physics, 17 papers in Electrical and Electronic Engineering and 15 papers in Materials Chemistry. Recurrent topics in C. Hartmann's work include GaN-based semiconductor devices and materials (35 papers), Semiconductor materials and devices (14 papers) and Acoustic Wave Resonator Technologies (13 papers). C. Hartmann is often cited by papers focused on GaN-based semiconductor devices and materials (35 papers), Semiconductor materials and devices (14 papers) and Acoustic Wave Resonator Technologies (13 papers). C. Hartmann collaborates with scholars based in Germany, United States and France. C. Hartmann's co-authors include J. Wollweber, Matthias Bickermann, Andrea Dittmar, K. Irmscher, M. Albrecht, R. Fornari, M. Weyers, Tobias Schulz, Carsten Netzel and A. Knauer and has published in prestigious journals such as Applied Physics Letters, Journal of Applied Physics and Molecules.

In The Last Decade

C. Hartmann

43 papers receiving 861 citations

Peers

C. Hartmann

CMP

EOMM

EEE

Elena Martínez Spain

Danping Zhuang United States

L.S. Tan Singapore

Zongshun Liu China

Satoshi Kurai Japan

Maki Kushimoto Japan

Zhiting Lin China

S.C. Wang Taiwan

O. Kryliouk United States

Ryan G. Banal Japan

Elena Martínez Spain

C. Hartmann

915 ×1.2

CMP

388 ×1.0

EOMM

177 ×0.5

365 ×1.1

201 ×0.8

EEE

Citations per year, relative to C. Hartmann C. Hartmann (= 1×) peers Elena Martínez

Countries citing papers authored by C. Hartmann

Since Specialization

Citations

This map shows the geographic impact of C. Hartmann's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by C. Hartmann with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites C. Hartmann more than expected).

Fields of papers citing papers by C. Hartmann

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by C. Hartmann. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by C. Hartmann. The network helps show where C. Hartmann may publish in the future.

Co-authorship network of co-authors of C. Hartmann

This figure shows the co-authorship network connecting the top 25 collaborators of C. Hartmann. A scholar is included among the top collaborators of C. Hartmann based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with C. Hartmann. C. Hartmann is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Hartmann, C., Michael Stöhr, Matthias Wagner, et al.. (2025). Comparative Study of Residual Stress and Defects in Single‐Crystalline (0001) AlN Wafers by Scanning Infrared Depolarization and White‐Beam X‐ray Topography. physica status solidi (a). 222(19).

Klump, Andrew, C. Hartmann, Matthias Bickermann, & Thomas L. Straubinger. (2024). Prediction of impurity concentrations in AlN single crystals by absorption at 230 nm using random forest regression. CrystEngComm. 27(2). 184–190.

Hartmann, C., Martin Guttmann, Uta Juda, et al.. (2024). Light Extraction and External Quantum Efficiency of 235 nm Far–Ultraviolet‐C Light‐Emitting Diodes on Single‐Crystal AlN Substrates. physica status solidi (a). 222(8). 1 indexed citations

Hartmann, C., Carsten Richter, Andrew Klump, et al.. (2023). Efficient diameter enlargement of bulk AlN single crystals with high structural quality. Applied Physics Express. 16(7). 75502–75502. 11 indexed citations

Mangelinck, D., Sylvia Hagedorn, H. Bracht, et al.. (2023). Silicon diffusion in AlN. Journal of Applied Physics. 134(9). 2 indexed citations

Straubinger, Thomas L., C. Hartmann, M. Albrecht, et al.. (2023). Dislocation Climb in AlN Crystals Grown at Low-Temperature Gradients Revealed by 3D X-ray Diffraction Imaging. Crystal Growth & Design. 23(3). 1538–1546. 5 indexed citations

Schulz, Tobias, Su‐Hyun Yoo, L. Lymperakis, et al.. (2022). Step pinning and hillock formation in (Al,Ga)N films on native AlN substrates. Journal of Applied Physics. 132(22). 7 indexed citations

Hartmann, C., et al.. (2021). Photochromism and influence of point defect charge states on optical absorption in aluminum nitride (AlN). Journal of Applied Physics. 129(11). 6 indexed citations

Hagedorn, Sylvia, et al.. (2021). High‐Temperature Annealing and Patterned AlN/Sapphire Interfaces. physica status solidi (b). 258(10). 20 indexed citations

10.

Moudrakovski, Igor, et al.. (2020). Local Electronic Structure in AlN Studied by Single-Crystal 27Al and 14N NMR and DFT Calculations. Molecules. 25(3). 469–469. 12 indexed citations

11.

Hartmann, C., et al.. (2020). Favourable growth conditions for the preparation of bulk AlN single crystals by PVT. CrystEngComm. 22(10). 1762–1768. 36 indexed citations

12.

Hagedorn, Sylvia, Sebastian Walde, A. Knauer, et al.. (2020). Status and Prospects of AlN Templates on Sapphire for Ultraviolet Light‐Emitting Diodes. physica status solidi (a). 217(14). 46 indexed citations

13.

Hartmann, C., J. Wollweber, Andrea Dittmar, et al.. (2019). Carbon pair defects in aluminum nitride. Journal of Applied Physics. 126(21). 13 indexed citations

14.

Sarkar, Biplab, Qiang Guo, Andrew Klump, et al.. (2018). The influence of point defects on the thermal conductivity of AlN crystals. Journal of Applied Physics. 123(18). 31 indexed citations

15.

Dittmar, Andrea, J. Wollweber, M. Schmidbauer, et al.. (2018). Physical vapor transport growth of bulk Al1−xScxN single crystals. Journal of Crystal Growth. 500. 74–79. 2 indexed citations

16.

Schulz, Tobias, M. Albrecht, K. Irmscher, et al.. (2011). Ultraviolet luminescence in AlN. physica status solidi (b). 248(6). 1513–1518. 51 indexed citations

17.

Siche, D., et al.. (2008). Surface preparation of AlN substrates. Crystal Research and Technology. 43(6). 651–655. 10 indexed citations

18.

Ruokonen, Peter, et al.. (2004). How does viscocanalostomy work? A new concept to the mode of action using scanning electron microscopy. Investigative Ophthalmology & Visual Science. 45(13). 5541–5541. 1 indexed citations

19.

Hartmann, C., et al.. (2002). Beeinflusst die Linsenart die stereoskopische Wahrnehmung?. Der Ophthalmologe. 99(1). 20–24. 1 indexed citations

20.

Wernecke, K. D., et al.. (2000). Intraocular antibody production in intraocular inflammation. Graefe s Archive for Clinical and Experimental Ophthalmology. 238(3). 222–227. 24 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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