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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2017,4,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Planar organic heterojunctions are widely used in photovoltaic cells, light-emitting diodes, and bilayer field-effect transistors. The energy level alignment in the devices plays an important role in obtaining the aspired gap arrangement. Additionally, the\n                    <jats:italic>\u03c0<\/jats:italic>\n                    -orbital overlap between the involved molecules defines e.g. the charge-separation efficiency in solar cells due to charge-transfer effects. To account for both aspects, direct\/inverse photoemission spectroscopy and near edge x-ray absorption fine structure spectroscopy were used to determine the energy level landscape and the molecular orientation at prototypical planar organic heterojunctions. The combined experimental approach results in a comprehensive model for the electronic and morphological characteristics of the interface between the two investigated molecular semiconductors.\n                  <\/jats:p>\n                  <jats:p>\n                    Following an introduction on heterojunctions used in devices and on energy levels of organic materials, the energy level alignment of planar organic heterojunctions will be discussed. The observed energy landscape is always determined by the individual arrangement between the energy levels of the molecules and the work function of the electrode. This might result in contact doping due to Fermi level pinning at the electrode for donor\/acceptor heterojunctions, which also improves the solar cell efficiency. This pinning behaviour can be observed across an unpinned interlayer and results in charge accumulation at the donor\/acceptor interface, depending on the transport levels of the respective organic semiconductors. Moreover, molecular orientation will affect the energy levels because of the anisotropy in ionisation energy and electron affinity and is influenced by the structural compatibility of the involved molecules at the heterojunction. High structural compatibility leads to\n                    <jats:italic>\u03c0<\/jats:italic>\n                    -orbital stacking between different molecules at a heterojunction, which is of additional interest for photovoltaic active interfaces and for ground-state charge-transfer.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/aa5a6c","type":"journal-article","created":{"date-parts":[[2017,2,14]],"date-time":"2017-02-14T05:14:22Z","timestamp":1487049262000},"page":"133001","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":27,"title":["Energy level alignment at planar organic heterojunctions: influence of contact doping and molecular orientation"],"prefix":"10.1088","volume":"29","author":[{"given":"Andreas","family":"Opitz","sequence":"first","affiliation":[{"name":"Humboldt-Universit\u00e4t zu Berlin"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2017,2,14]]},"reference":[{"key":"cmaa5a6cbib001","doi-asserted-by":"publisher","author":"Br\u00fctting","year":"2012","DOI":"10.1002\/9783527654949","type":"book"},{"key":"cmaa5a6cbib002","doi-asserted-by":"publisher","author":"K\u00f6hler","year":"2015","DOI":"10.1002\/9783527685172.ch4","type":"book"},{"key":"cmaa5a6cbib003","doi-asserted-by":"publisher","first-page":"913","DOI":"10.1063\/1.98799","type":"journal-article","article-title":"Organic electroluminescent diodes","volume":"51","author":"Tang","year":"1987","journal-title":"Appl. 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