Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells

Zinc oxide (ZnO) is an important material for polymer solar cells (PSCs) where the characteristics of the interface can dominate both the efficiency and lifetime of the device. In this work we study the effect of fluorine (SF6) plasma surface treatment of ZnO films on the performance of PSCs with an inverted structure. The interaction between fluorine species present in the SF6 plasma and the ZnO surface is also investigated in detail. We provide fundamental insights into the passivation effect of fluorine by analyzing our experimental results and theoretical calculations and we propose a mechanism according to which a fluorine atom substitutes an oxygen atom or occupies an oxygen vacancy site eliminating an electron trap while it may also attract hydrogen atoms thus favoring hydrogen doping. These multiple fluorine roles can reduce both the recombination losses and the electron extraction barrier at the ZnO/fullerene interface improving the selectivity of the cathode contact. Therefore, the fabricated devices using the fluorine plasma treated ZnO show high efficiency and stable characteristics, irrespective of the donor : acceptor combinations in the photoactive blend. Inverted polymer solar cells, consisting of the P3HT:PC71BM blend, exhibited increased lifetime and high power conversion efficiency (PCE) of 4.6%, while the ones with the PCDTBT:PC71BM blend exhibited a PCE of 6.9%. Our champion devices with the PTB7:PC71BM blends reached a high PCE of 8.0% and simultaneously showed exceptional environmental stability when using the fluorine passivated ZnO cathode interlayers

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Gehalten durch M. Johannem Carrln/ Pfarrern zu DernburgDruckvariante: 23:264728L (vgl. Umfangsangabe!

Survey of undergraduate pain curricula for healthcare professionals in the United Kingdom

The prevalence and burden of pain has long been reported as problematic. Comprehensive pain education in undergraduate programmes is essential for developing knowledgeable, skilled and effective healthcare professionals. This cross-sectional survey describes the nature, content and learning strategies for pain curricula in undergraduate healthcare programmes in major universities in the United Kingdom (UK). Document analysis also highlighted gaps in pain-related standards from professional regulators and a higher education quality assurance body. The sample consisted of 19 higher education institutions delivering 108 programmes across dentistry, medicine, midwifery, nursing, occupational therapy, pharmacy, physiotherapy and veterinary science. Seventy-four (68.5%) questionnaires were returned averaging 12.0 h of pain content with physiotherapy and veterinary science students receiving the highest input. Pain education accounted for less than 1% of programme hours for some disciplines. Traditional teaching methods dominated (e.g. lectures 87.8%) and only two programmes had fully implemented the International Association for the Study of Pain's (IASP) curricula. Minimal pain-related standards were found from professional regulators and the quality assurance documents. Pain education is variable across and within disciplines and interprofessional learning is minimal. Published curricula for pain education have been available for over 20 years but are rarely employed and pain is not a core part of regulatory and quality assurance standards for health professions. The hours of pain education is woefully inadequate given the prevalence and burden of pain. Recommendations include the introduction of pain-related educational standards across all professions, greater integration of pain content in undergraduate programmes and interprofessional approaches to the topic