An increase of work function （0.3 eV） is achieved by irradiating poly（3,4-ethylenedioxythiophene）：poly（styrene sul- fonate） （PEDOT：PSS） film in vacuum with 254-nm ultraviolet （UV） light. The mechanism for ...An increase of work function （0.3 eV） is achieved by irradiating poly（3,4-ethylenedioxythiophene）：poly（styrene sul- fonate） （PEDOT：PSS） film in vacuum with 254-nm ultraviolet （UV） light. The mechanism for such an improvement is investigated by photoelectron yield spectroscopy, X-ray photo electron energy spectrum, and field emission technique. Sur- face oxidation and composition change are found as the reasons for work function increase. The UV-treated PEDOT：PSS film is used as the hole injection layer in a hole-only device. Hole injection is improved by UV-treated PEDOT：PSS film without baring the enlargement of film resistance. Our result demonstrates that UV treatment is more suitable for modifying the injection barrier than UV ozone exposure.展开更多
使用甲醇溶剂熏蒸聚(4,8-双[5-(2-乙基己基)噻吩-2-基]苯并[1,2-b;4,5-b']双噻吩-2,6-双基-{4-(2-乙基己基)-3-氟代噻吩[3,4-b]噻吩-}-2-羧基-2,6-双基)(PTB7-Th)和聚[N,N'-双(2-辛基十二烷基)-1,4,5,8-萘二酰亚胺-2,6-双基-并-...使用甲醇溶剂熏蒸聚(4,8-双[5-(2-乙基己基)噻吩-2-基]苯并[1,2-b;4,5-b']双噻吩-2,6-双基-{4-(2-乙基己基)-3-氟代噻吩[3,4-b]噻吩-}-2-羧基-2,6-双基)(PTB7-Th)和聚[N,N'-双(2-辛基十二烷基)-1,4,5,8-萘二酰亚胺-2,6-双基-并-5,5'-(2,2'-双噻吩)](N2200)二元混合的活性层薄膜,发现其活性层和镀金探针间的接触电势差从37 m V升高到160 m V,表明活性层表面功函由4.71 e V降低到4.59 e V.XPS结果表明,由于甲醇和N2200之间更强的相互作用,在溶剂熏蒸过程中有更多的N2200分子扩散到薄膜表面.扩散引起了活性层表面功函的减小,使活性层和电极之间能级更加匹配,形成了更好的欧姆接触,使器件的功率转化效率提高了10%以上.展开更多
运用模拟软件AFORS-HET对TCO/a-Si∶H(n)/a-Si∶H(i)/c-Si(p)/Ag结构的异质结(HIT)太阳电池进行仿真,分析其光伏输出特性随发射层掺杂浓度、晶硅衬底掺杂浓度、透明导电氧化物薄膜(TCO)的选择以及TCO功函数的变化规律。结果显示,当发射...运用模拟软件AFORS-HET对TCO/a-Si∶H(n)/a-Si∶H(i)/c-Si(p)/Ag结构的异质结(HIT)太阳电池进行仿真,分析其光伏输出特性随发射层掺杂浓度、晶硅衬底掺杂浓度、透明导电氧化物薄膜(TCO)的选择以及TCO功函数的变化规律。结果显示,当发射层掺杂浓度大于1.0×1020cm^(-3),晶硅衬底掺杂浓度大于1.2×10^(16)cm^(-3),以ZnO为TCO层且Zn O的功函数低于4.4 e V时,电池的开路电压、短路电流密度、填充因子及电池转换效率达到最优值,光电转换效率最高达到19.18%。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61076057,61376059,61171023,and 91221202,)the National Basic Research Program of China(Grant Nos.2012CB932701 and 2011CB933001)
文摘An increase of work function （0.3 eV） is achieved by irradiating poly（3,4-ethylenedioxythiophene）：poly（styrene sul- fonate） （PEDOT：PSS） film in vacuum with 254-nm ultraviolet （UV） light. The mechanism for such an improvement is investigated by photoelectron yield spectroscopy, X-ray photo electron energy spectrum, and field emission technique. Sur- face oxidation and composition change are found as the reasons for work function increase. The UV-treated PEDOT：PSS film is used as the hole injection layer in a hole-only device. Hole injection is improved by UV-treated PEDOT：PSS film without baring the enlargement of film resistance. Our result demonstrates that UV treatment is more suitable for modifying the injection barrier than UV ozone exposure.
文摘使用甲醇溶剂熏蒸聚(4,8-双[5-(2-乙基己基)噻吩-2-基]苯并[1,2-b;4,5-b']双噻吩-2,6-双基-{4-(2-乙基己基)-3-氟代噻吩[3,4-b]噻吩-}-2-羧基-2,6-双基)(PTB7-Th)和聚[N,N'-双(2-辛基十二烷基)-1,4,5,8-萘二酰亚胺-2,6-双基-并-5,5'-(2,2'-双噻吩)](N2200)二元混合的活性层薄膜,发现其活性层和镀金探针间的接触电势差从37 m V升高到160 m V,表明活性层表面功函由4.71 e V降低到4.59 e V.XPS结果表明,由于甲醇和N2200之间更强的相互作用,在溶剂熏蒸过程中有更多的N2200分子扩散到薄膜表面.扩散引起了活性层表面功函的减小,使活性层和电极之间能级更加匹配,形成了更好的欧姆接触,使器件的功率转化效率提高了10%以上.
文摘运用模拟软件AFORS-HET对TCO/a-Si∶H(n)/a-Si∶H(i)/c-Si(p)/Ag结构的异质结(HIT)太阳电池进行仿真,分析其光伏输出特性随发射层掺杂浓度、晶硅衬底掺杂浓度、透明导电氧化物薄膜(TCO)的选择以及TCO功函数的变化规律。结果显示,当发射层掺杂浓度大于1.0×1020cm^(-3),晶硅衬底掺杂浓度大于1.2×10^(16)cm^(-3),以ZnO为TCO层且Zn O的功函数低于4.4 e V时,电池的开路电压、短路电流密度、填充因子及电池转换效率达到最优值,光电转换效率最高达到19.18%。
