Ralf Hunger

2.5k total citations · 1 hit paper
62 papers, 2.1k citations indexed

About

Ralf Hunger is a scholar working on Electrical and Electronic Engineering, Materials Chemistry and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, Ralf Hunger has authored 62 papers receiving a total of 2.1k indexed citations (citations by other indexed papers that have themselves been cited), including 50 papers in Electrical and Electronic Engineering, 39 papers in Materials Chemistry and 17 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in Ralf Hunger's work include Chalcogenide Semiconductor Thin Films (31 papers), Quantum Dots Synthesis And Properties (28 papers) and Copper-based nanomaterials and applications (20 papers). Ralf Hunger is often cited by papers focused on Chalcogenide Semiconductor Thin Films (31 papers), Quantum Dots Synthesis And Properties (28 papers) and Copper-based nanomaterials and applications (20 papers). Ralf Hunger collaborates with scholars based in Germany, Japan and United States. Ralf Hunger's co-authors include Wolfram Jaegermann, Shigeru Niki, Koji Matsubara, Paul Fons, Roland Scheer, М. В. Лебедев, A. Yamada, Ken Nakahara, H. Takasu and Bengt Jaeckel and has published in prestigious journals such as Journal of the American Chemical Society, Applied Physics Letters and Journal of Applied Physics.

In The Last Decade

Ralf Hunger

61 papers receiving 2.0k citations

Hit Papers

A review of hydrogen storage and transport technologies 2023 2026 2024 2025 2023 50 100 150
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. A review of hydrogen storage and transport technologies
    2023 153 citations Miao Yang, Ralf Hunger et al. Clean Energy profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Ralf Hunger Germany 27 1.4k 1.3k 396 343 247 62 2.1k
Toshimasa Wadayama Japan 24 1.1k 0.8× 818 0.6× 226 0.6× 1.2k 3.6× 176 0.7× 136 2.0k
Hans‐Joachim Lewerenz United States 17 728 0.5× 776 0.6× 153 0.4× 857 2.5× 136 0.6× 38 1.4k
V. M. Aroutiounian Armenia 25 1.6k 1.1× 1.2k 0.9× 401 1.0× 586 1.7× 164 0.7× 187 2.5k
Saswata Bhattacharya India 30 1.1k 0.7× 2.0k 1.5× 279 0.7× 478 1.4× 257 1.0× 117 2.5k
J. J. Kelly Netherlands 23 1.1k 0.8× 743 0.6× 296 0.7× 220 0.6× 139 0.6× 78 1.6k
Massimo Tallarida Germany 23 1.3k 0.9× 987 0.7× 268 0.7× 798 2.3× 220 0.9× 72 1.9k
Ferry Anggoro Ardy Nugroho Sweden 24 1.3k 0.9× 784 0.6× 150 0.4× 339 1.0× 480 1.9× 51 2.1k
Brian E. McCandless United States 34 3.5k 2.4× 3.1k 2.3× 713 1.8× 844 2.5× 125 0.5× 152 4.0k
Ole Lytken Germany 23 708 0.5× 1.6k 1.2× 381 1.0× 377 1.1× 137 0.6× 55 2.1k
Qingming Deng China 26 583 0.4× 1.5k 1.1× 186 0.5× 593 1.7× 212 0.9× 61 2.2k

Countries citing papers authored by Ralf Hunger

Since Specialization
Citations

This map shows the geographic impact of Ralf Hunger'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 Ralf Hunger with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ralf Hunger more than expected).

Fields of papers citing papers by Ralf Hunger

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ralf Hunger. 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 Ralf Hunger. The network helps show where Ralf Hunger may publish in the future.

Co-authorship network of co-authors of Ralf Hunger

This figure shows the co-authorship network connecting the top 25 collaborators of Ralf Hunger. A scholar is included among the top collaborators of Ralf Hunger 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 Ralf Hunger. Ralf Hunger is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Yang, Miao, et al.. (2023). A review of hydrogen storage and transport technologies. Clean Energy. 7(1). 190–216. 153 indexed citations breakdown →
2.
Hunger, Ralf, Tobias Jarmar, Erik Wallin, et al.. (2012). Homogeneity of Ga Grading in CIGS Solar Modules. EU PVSEC. 2254–2258. 1 indexed citations
3.
Rigsby, Matthew A., Wei-Ping Zhou, Adam Lewera, et al.. (2008). Experiment and Theory of Fuel Cell Catalysis: Methanol and Formic Acid Decomposition on Nanoparticle Pt/Ru. The Journal of Physical Chemistry C. 112(39). 15595–15601. 97 indexed citations
4.
Ōsaka, Tetsuya, Mariko Matsunaga, Daisuke Niwa, et al.. (2007). Electrical and Electrochemical Properties of Alkyl-Monolayer Modified Si(111) in the Presence of Water. Journal of The Electrochemical Society. 154(11). H919–H919. 6 indexed citations
5.
Hai, Nguyen Thi Minh, et al.. (2007). Combined Scanning Tunneling Microscopy and Synchrotron X-Ray Photoemission Spectroscopy Results on the Oxidative CuI Film Formation on Cu(111). The Journal of Physical Chemistry C. 111(40). 14768–14781. 19 indexed citations
6.
7.
Jaeckel, Bengt, Ralf Hunger, Lauren J. Webb, Wolfram Jaegermann, & Nathan S. Lewis. (2007). High-Resolution Synchrotron Photoemission Studies of the Electronic Structure and Thermal Stability of CH3- and C2H5-Functionalized Si(111) Surfaces. The Journal of Physical Chemistry C. 111(49). 18204–18213. 39 indexed citations
8.
Babu, Panakkattu K., Adam Lewera, Jong Ho Chung, et al.. (2007). Selenium Becomes Metallic in Ru−Se Fuel Cell Catalysts:  An EC-NMR and XPS Investigation. Journal of the American Chemical Society. 129(49). 15140–15141. 103 indexed citations
9.
10.
Hunger, Ralf, T. Schulmeyer, Andreas Klein, et al.. (2005). SXPS investigation of the Cd partial electrolyte treatment of CuInSe2 absorbers. Thin Solid Films. 480-481. 218–223. 12 indexed citations
11.
Hunger, Ralf & C. Pettenkofer. (2005). Band structure investigation of chalcopyrite CuInSe2(001) by angle-resolved photoelectron spectroscopy. MRS Proceedings. 865. 1 indexed citations
12.
Esser, N., et al.. (2004). Surface structure of CuGaSe2 (001). Thin Solid Films. 480-481. 382–387. 6 indexed citations
13.
Hunger, Ralf, T. Schulmeyer, Andreas Klein, et al.. (2004). An option for the surface science on Cu chalcopyrites: the selenium capping and decapping process. Surface Science. 557(1-3). 263–268. 17 indexed citations
14.
Sakurai, K., Ralf Hunger, Takashi Baba, et al.. (2003). Properties of CuInGaSe2 solar cells based upon an improved three-stage process. Thin Solid Films. 431-432. 6–10. 28 indexed citations
15.
Hunger, Ralf, K. Sakurai, Akimasa Yamada, et al.. (2003). In situ deposition rate monitoring during the three-stage-growth process of Cu(In,Ga)Se2 absorber films. Thin Solid Films. 431-432. 16–21. 23 indexed citations
16.
Säuberlich, F., J. Fritsche, Ralf Hunger, & Andreas Klein. (2003). Properties of sputtered ZnO films and its interfaces with CdS. Thin Solid Films. 431-432. 378–381. 35 indexed citations
17.
Hunger, Ralf, Kakuya Iwata, Paul Fons, et al.. (2001). Control of Optical and Electrical Properties of ZnO Films for Photovoltaic Applications. MRS Proceedings. 668. 4 indexed citations
18.
Nakahara, Ken, Tetsuhiro Tanabe, H. Takasu, et al.. (2001). Growth of Undoped ZnO Films with Improved Electrical Properties by Radical Source Molecular Beam Epitaxy. Japanese Journal of Applied Physics. 40(1R). 250–250. 76 indexed citations
19.
Hunger, Ralf, et al.. (2000). Structure of extended defects in epitaxial CuInS 2 /Si(111). Thin Solid Films. 361-362. 437–442. 10 indexed citations
20.
Su, Dang Sheng, Wolfgang Neumann, Ralf Hunger, et al.. (1998). CuAu-type ordering in epitaxial CuInS2 films. Applied Physics Letters. 73(6). 785–787. 56 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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