Sökning: "secondary phases"

Visar resultat 1 - 5 av 142 avhandlingar innehållade orden secondary phases.

  1. 1. Annealing of Cu2ZnSn(S,Se)4 Thin Films : A Study of Secondary Compounds and Their Effects on Solar Cells

    Författare :Yi Ren; Charlotte Platzer-Björkman; Maarja Grossberg; Uppsala universitet; []
    Nyckelord :Annealing; sputtering; thin film; CZTS; secondary phases; solar cell; Engineering Science; Teknisk fysik;

    Sammanfattning : Kesterite Cu2ZnSnS4 (CZTS) is interesting as a sustainable photovoltaic technology due to its earth-abundant elements and suitable semiconducting properties. To date, a record efficiency of 12.6% has been achieved but further improvements are required to reach high efficiency for industrial implementation. LÄS MER

  3. 2. Teachers' Retention in Tanzanian Remote Secondary Schools : Exploring Perceived Challenges and Support

    Författare :Raymond Boniface; Martin Stigmar; Jan Håkansson; Christer Ohlin; Sven Andersson; Linnéuniversitetet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Challenges; Organizational Support; Remote Schools; Secondary Education; Support; Teacher Retention; Tanzania; Education; Pedagogik;

    Sammanfattning : Teacher retention is a global challenge, and many developed and developing countries are struggling to staff and retain teachers in schools, particularly in low-performing, remote, and less desirable areas. In most of these countries, Tanzania in particular, the efficacy of fiscally inclined teachers’ retention strategies continues to be dubious. LÄS MER

  4. 3. Microscopic Characterisation of Solar Cells : An Electron Microscopy Study of Cu(In,Ga)Se2 and Cu2ZnSn(S,Se)4 Solar Cells

    Författare :Jörn Timo Wätjen; Marika Edoff; Angus Rockett; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEM; SEM; FIB; solar cell; CIGS; CZTS; Alternative buffer layers; Gallium gradients; microscopic electrical characterisation; Secondary Phases; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

    Sammanfattning : The sun provides us with a surplus of energy convertible to electricity using solar cells. This thesis focuses on solar cells based on chalcopyrite (CIGSe) as well as kesterite (CZTS(e)) absorber layers. These materials yield record efficiencies of 20.4 % and 11. LÄS MER

  5. 4. Defect Engineering in Kesterite Materials for Thin Film Solar Cells

    Författare :Katharina Rudisch; Jonathan J. Scragg; Alain Lafond; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CZTS; thin film solar cells; defect engineering; composition-spread films; order disorder transition; intrinsic defects; secondary phases; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

    Sammanfattning : Cu2ZnSnS4 has great potential to be applied as an earth abundant and non-toxic absorber material in thin film solar cells, based on its suitable optical properties. However, several challenges have prevented the achievable efficiencies from exceeding 12.6 %, which is well below marketable efficiencies compared to competing solar cell technologies. LÄS MER

  7. 5. Primary and secondary process thinking in creative performance: group, alcohol and emotional influences

    Författare :Nina Svensson; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; creativity; primary process; secondary process; group work; de Bono; alcohol; agression;

    Sammanfattning : Degree of licentiate in psychology Abstract Svensson, N (2010). Primary and secondary process thinking in creative performance: group, alcohol and emotional influences. Department of psychology, university of Gothenburg, Sweden. LÄS MER