{"id":"https://openalex.org/A5063899677","orcid":null,"observed_orcids":[],"display_name":"Stephan Sprengel","raw_author_names":["S Sprengel","S. Sprengel","Sprengel Stephan","Sprengel, Stephan","Stephan Sprengel"],"full_name":"Stephan Sprengel","works_count":50,"cited_by_count":790,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":18,"i10_index":19},"ids":{"openalex":"https://openalex.org/A5063899677","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I154570441","ror":"https://ror.org/02t274463","display_name":"University of California, Santa Barbara","country_code":"US","type":"education","lineage":["https://openalex.org/I154570441"]},"years":[2017]},{"institution":{"id":"https://openalex.org/I187152970","ror":"https://ror.org/04hfv3620","display_name":"Benue State University","country_code":"NG","type":"education","lineage":["https://openalex.org/I187152970"]},"years":[2017]},{"institution":{"id":"https://openalex.org/I28290843","ror":"https://ror.org/00ks66431","display_name":"University of Surrey","country_code":"GB","type":"education","lineage":["https://openalex.org/I28290843"]},"years":[2017]},{"institution":{"id":"https://openalex.org/I4210114974","ror":"https://ror.org/02kcbn207","display_name":"IMEC","country_code":"BE","type":"nonprofit","lineage":["https://openalex.org/I4210114974"]},"years":[2018]},{"institution":{"id":"https://openalex.org/I62916508","ror":"https://ror.org/02kkvpp62","display_name":"Technical University of Munich","country_code":"DE","type":"education","lineage":["https://openalex.org/I62916508"]},"years":[2019,2018,2017,2016,2015,2014,2013,2012,2011]}],"last_known_institutions":[{"id":"https://openalex.org/I62916508","ror":"https://ror.org/02kkvpp62","display_name":"Technical University of Munich","country_code":"DE","type":"education","lineage":["https://openalex.org/I62916508"]}],"topics":[{"id":"https://openalex.org/T11429","display_name":"Semiconductor Lasers and Optical Devices","count":45,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10022","display_name":"Semiconductor Quantum Structures and Devices","count":34,"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10299","display_name":"Photonic and Optical Devices","count":31,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11637","display_name":"Advanced Semiconductor Detectors and Materials","count":9,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12309","display_name":"solar cell performance optimization","count":9,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"topic_share":[{"id":"https://openalex.org/T11429","display_name":"Semiconductor Lasers and Optical Devices","value":0.0001129,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10299","display_name":"Photonic and Optical Devices","value":0.0001015,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10022","display_name":"Semiconductor Quantum Structures and Devices","value":9.04e-05,"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12309","display_name":"solar cell performance optimization","value":7.96e-05,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11637","display_name":"Advanced Semiconductor Detectors and Materials","value":4.01e-05,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"x_concepts":[{"id":"49040817","wikidata":"https://www.wikidata.org/wiki/Q193091","display_name":"Optoelectronics","score":0.823928952217102},{"id":"520434653","wikidata":"https://www.wikidata.org/wiki/Q38867","display_name":"Laser","score":0.8088252544403076},{"id":"192562407","wikidata":"https://www.wikidata.org/wiki/Q228736","display_name":"Materials science","score":0.802444338798523},{"id":"120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","score":0.7424333691596985},{"id":"121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","score":0.3488351106643677}],"counts_by_year":[{"year":2011,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2012,"works_count":8,"oa_works_count":0,"cited_by_count":10},{"year":2013,"works_count":2,"oa_works_count":1,"cited_by_count":21},{"year":2014,"works_count":2,"oa_works_count":0,"cited_by_count":14},{"year":2015,"works_count":7,"oa_works_count":1,"cited_by_count":27},{"year":2016,"works_count":10,"oa_works_count":6,"cited_by_count":55},{"year":2017,"works_count":13,"oa_works_count":7,"cited_by_count":61},{"year":2018,"works_count":6,"oa_works_count":4,"cited_by_count":78},{"year":2019,"works_count":1,"oa_works_count":1,"cited_by_count":96},{"year":2020,"works_count":0,"oa_works_count":0,"cited_by_count":60},{"year":2021,"works_count":0,"oa_works_count":0,"cited_by_count":60},{"year":2022,"works_count":0,"oa_works_count":0,"cited_by_count":59},{"year":2023,"works_count":0,"oa_works_count":0,"cited_by_count":65},{"year":2024,"works_count":0,"oa_works_count":0,"cited_by_count":79},{"year":2025,"works_count":0,"oa_works_count":0,"cited_by_count":61},{"year":2026,"works_count":0,"oa_works_count":0,"cited_by_count":44}],"display_name_alternatives":["S Sprengel","S. Sprengel","Sprengel Stephan","Sprengel, Stephan","Stephan Sprengel"],"block_key":"s sprengel","works_api_url":"https://api.openalex.org/works?filter=author.id:A5063899677","updated_date":"2026-11-08T12:57:04","created_date":"2016-06-24T00:00:00"}
