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Japan Engineering & Technology / Energy Engineering 111 Scientists Subject Rankings
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 211 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 5 years. As of Jan 03, 2026, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (1.131.752) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H Index Rankings
Rankings
18,822
World Rank
276
Country Rank
26
University
Ranking Based On Selection:
1
Engineering & Technology / Energy Engineering
Energy-efficient micro-electronics design | Power electronics | Flexible electronics desig
Energy-efficient micro-electronics design | Power electronics | Flexible electronics desig
H-Index Metrics
-
H-Index86
-
i10 Index427
-
Citation Counts35,335
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* Total H Index Rankings
Rankings
32,459
World Rank
504
Country Rank
5
University
Ranking Based On Selection:
2
* Total H Index Rankings
Rankings
35,923
World Rank
573
Country Rank
5
University
Ranking Based On Selection:
3
* Total H Index Rankings
Rankings
43,239
World Rank
716
Country Rank
65
University
Ranking Based On Selection:
4
Engineering & Technology / Energy Engineering
Battery | Fuel cells | Water electrolysis | Electrochemistry | solid state ionic
Battery | Fuel cells | Water electrolysis | Electrochemistry | solid state ionic
H-Index Metrics
-
H-Index66
-
i10 Index324
-
Citation Counts20,186
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* Total H Index Rankings
Rankings
48,192
World Rank
809
Country Rank
3
University
Ranking Based On Selection:
5
* Total H Index Rankings
Rankings
49,082
World Rank
830
Country Rank
55
University
Ranking Based On Selection:
6
Engineering & Technology / Energy Engineering
Energy Systems | Heat Transfer | Hydrogen/Ammonia Production-Storage-Utilization | Carbon-Free System | Electric Vehicle Utilizatio
Energy Systems | Heat Transfer | Hydrogen/Ammonia Production-Storage-Utilization | Carbon-Free System | Electric Vehicle Utilizatio
H-Index Metrics
-
H-Index63
-
i10 Index243
-
Citation Counts13,530
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* Total H Index Rankings
Rankings
53,209
World Rank
926
Country Rank
2
University
Ranking Based On Selection:
7
* Total H Index Rankings
Rankings
56,625
World Rank
1,016
Country Rank
89
University
Ranking Based On Selection:
8
Engineering & Technology / Energy Engineering
Nexus | Sustainability | Energy | Minerals | Sustainable Desig
Nexus | Sustainability | Energy | Minerals | Sustainable Desig
H-Index Metrics
-
H-Index60
-
i10 Index120
-
Citation Counts11,929
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* Total H Index Rankings
Rankings
69,931
World Rank
1,267
Country Rank
2
University
Ranking Based On Selection:
9
Engineering & Technology / Energy Engineering
photocatalysis | solar energy conversion | energy storage | electrocatalysi
photocatalysis | solar energy conversion | energy storage | electrocatalysi
H-Index Metrics
-
H-Index56
-
i10 Index118
-
Citation Counts28,218
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* Total H Index Rankings
Rankings
74,668
World Rank
1,393
Country Rank
67
University
Ranking Based On Selection:
10
Engineering & Technology / Energy Engineering
Solar Cells | Crystal Growth | Defect Engineering | Materials and Process Informatic
Solar Cells | Crystal Growth | Defect Engineering | Materials and Process Informatic
H-Index Metrics
-
H-Index55
-
i10 Index308
-
Citation Counts13,840
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* Total H Index Rankings
Rankings
79,829
World Rank
1,498
Country Rank
4
University
Ranking Based On Selection:
11
Engineering & Technology / Energy Engineering
Solar cell | Compound semiconductor | Silicon | Device simulation | PV module-system-outdoor testin
Solar cell | Compound semiconductor | Silicon | Device simulation | PV module-system-outdoor testin
H-Index Metrics
-
H-Index53
-
i10 Index187
-
Citation Counts13,870
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* Total H Index Rankings
Rankings
96,318
World Rank
1,894
Country Rank
65
University
Ranking Based On Selection:
12
Engineering & Technology / Energy Engineering
solar cells | semiconductors | Cu(InGa)Se2 | Si | Cu2ZnSnS
solar cells | semiconductors | Cu(InGa)Se2 | Si | Cu2ZnSnS
H-Index Metrics
-
H-Index50
-
i10 Index189
-
Citation Counts8,569
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* Total H Index Rankings
Rankings
110,736
World Rank
2,194
Country Rank
13
University
Ranking Based On Selection:
13
Engineering & Technology / Energy Engineering
Solar cells | Photovoltaics | Ellipsometry | Optical characterizatio
Solar cells | Photovoltaics | Ellipsometry | Optical characterizatio
H-Index Metrics
-
H-Index47
-
i10 Index103
-
Citation Counts12,669
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* Total H Index Rankings
Rankings
123,501
World Rank
2,467
Country Rank
19
University
Ranking Based On Selection:
14
Engineering & Technology / Energy Engineering
Energy | Energy Systems | Energy Management | Cogeneration | Optimizatio
Energy | Energy Systems | Energy Management | Cogeneration | Optimizatio
H-Index Metrics
-
H-Index45
-
i10 Index133
-
Citation Counts6,989
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* Total H Index Rankings
Rankings
123,508
World Rank
2,468
Country Rank
175
University
Ranking Based On Selection:
15
Engineering & Technology / Energy Engineering
Energy Policy | Environment | Catalysis | Materials | Quasicrysta
Energy Policy | Environment | Catalysis | Materials | Quasicrysta
H-Index Metrics
-
H-Index45
-
i10 Index130
-
Citation Counts6,486
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* Total H Index Rankings
Rankings
126,943
World Rank
2,522
Country Rank
180
University
Ranking Based On Selection:
16
* Total H Index Rankings
Rankings
127,322
World Rank
2,528
Country Rank
182
University
Ranking Based On Selection:
17
Engineering & Technology / Energy Engineering
Organometallics | Catalysis | Carbon Dioxide | Coordination Chemistr
Organometallics | Catalysis | Carbon Dioxide | Coordination Chemistr
H-Index Metrics
-
H-Index44
-
i10 Index98
-
Citation Counts7,405
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* Total H Index Rankings
Rankings
145,651
World Rank
2,977
Country Rank
146
University
Ranking Based On Selection:
18
* Total H Index Rankings
Rankings
150,420
World Rank
3,056
Country Rank
9
University
Ranking Based On Selection:
19
Engineering & Technology / Energy Engineering
Solar Cell | Compound semiconductor | Transparent conducting film | Thermoelectric materia
Solar Cell | Compound semiconductor | Transparent conducting film | Thermoelectric materia
H-Index Metrics
-
H-Index41
-
i10 Index119
-
Citation Counts8,969
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* Total H Index Rankings
Rankings
181,878
World Rank
3,770
Country Rank
22
University
Ranking Based On Selection:
20
Engineering & Technology / Energy Engineering
Perovskite solar cells | Surface sciences | Crystalline materials | Energy materials and device
Perovskite solar cells | Surface sciences | Crystalline materials | Energy materials and device
H-Index Metrics
-
H-Index37
-
i10 Index52
-
Citation Counts5,260
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* Total H Index Rankings
Rankings
189,304
World Rank
3,922
Country Rank
11
University
Ranking Based On Selection:
21
Engineering & Technology / Energy Engineering
Ceramics Engineering | Nanotechnology | Power Engineering | Environmental Engineering | Energy engineerin
Ceramics Engineering | Nanotechnology | Power Engineering | Environmental Engineering | Energy engineerin
H-Index Metrics
-
H-Index37
-
i10 Index138
-
Citation Counts5,283
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* Total H Index Rankings
Rankings
192,129
World Rank
4,018
Country Rank
125
University
Ranking Based On Selection:
22
* Total H Index Rankings
Rankings
201,801
World Rank
4,213
Country Rank
5
University
Ranking Based On Selection:
23
* Total H Index Rankings
Rankings
213,951
World Rank
4,527
Country Rank
10
University
Ranking Based On Selection:
24
* Total H Index Rankings
Rankings
214,888
World Rank
4,557
Country Rank
28
University
Ranking Based On Selection:
25
Engineering & Technology / Energy Engineering
Organic solar cell | Light-emitting diode | Wearable devic
Organic solar cell | Light-emitting diode | Wearable devic
H-Index Metrics
-
H-Index34
-
i10 Index47
-
Citation Counts3,771
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Premium Data
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