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In recent years organic semiconductors have attracted considerable interest due to th growing potential as active materials in electronic and optoelectronic devices. A long standing paradigm, however. has been seen in their unipolar transport of electrical charges. Thus multi-layer structures comprising different organic materials faith spatially separated electron and hole transport layers inhere used for fabricating efficient organ light-emitting diodes [1]. On the other hand in photovoltaic devices. owing to she exciton diffusion length in organic semiconductors. p- and n-conducting materials need be in close contact which is usually realized by mixing them in one single layer yielding so called bulk-heterojunction structure [2-5]. Recently，such donor-acceptormixtures ha been implemented also in organic field-effect transistors (OFETs). Ambipolar OFE have been realized faith a variety of material combinations. including polymer fullere blends [6], mixtures of soluble oligomers [7] as well as evaporated molecular hetero-lay structures and mixed layers [8]. Our recent studies in this field have focussed on the combination of hole conducting copper-phthalocyanine (CuPc) with the electron conducting fullerene C60. We have investigated OFETs with various mixing ratios and film preparation conditions and have demonstrated ambipolar inverters with these blends [9]. Using photoelectric spectroscopy, Are have recently determined the occupied electronic levels and the changes upon mixing both materials [10]. in this contribution we will summarize the result and discuss their implications in the context of photovoltaic cells based on combination of CuPc as electron donor and C60 as electron acceptor, respectively. particular eve will demonstrate that differences in the open-circuit voltages of heterolayer cells and bulk-heterojunction devices can be traced back to the electronic structure of the blends. |
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04120152 
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有几处拼写错误 In recent years organic semiconductors have attracted considerable interest due to their growing potential as active materials in electronic and optoelectronic devices. A long-standing paradigm, however, has been seen in their unipolar transport of electrical charges. Thus multi-layer structures comprising different organic materials with spatially separated electron and hole transport layers where used for fabricating efficient organic light-emitting diodes [1]. On the other hand in photovoltaic devices, owing to short exciton diffusion length in organic semiconductors, p- and n-conducting materials need to be in close contact which is usually realized by mixing them in one single layer yielding a so-called bulk-heterojunction structure [2-5]. Recently, such donor-acceptor mixtures have been implemented also in organic field-effect transistors (OFETs). Ambipolar OFETs have been realized with a variety of material combinations, including polymer/fullerene blends [6], mixtures of soluble oligomers [7] as well as evaporated molecular hetero-layer structures and mixed layers [8]. Our recent studies in this field have focussed on the combination of hole conducting copper-phthalocyanine (CuPc) with the electron conducting fullerene C60. We have investigated OFETs with various mixing ratios and film preparation conditions and have demonstrated ambipolar inverters with these blends [9]. Using photoelectron spectroscopy, we have recently determined the occupied electronic levels and their changes upon mixing both materials [10]. In this contribution we will summarize these results and discuss their implications in the context of photovoltaic cells based on a combination of CuPc as electron donor and C60 as electron acceptor, respectively. In particular we will demonstrate that differences in the open-circuit voltages of heterolayer cells and bulk-heterojunction devices can be traced back to the electronic structure of the blends. |
3楼2008-04-21 18:54:44
xiaowenzhi16
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2楼2008-04-21 16:48:05
04120152
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4楼2009-01-27 23:59:50
