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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electron Injection Efficiency and Diffusion Length in Dye-Sensitized Solar Cells Derived from Incident Photon Conversion Efficiency Measurements
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Electron Injection Efficiency and Diffusion Length in Dye-Sensitized Solar Cells Derived from Incident Photon Conversion Efficiency Measurements

机译：从入射光子转换效率测量得出的染料敏化太阳能电池中的电子注入效率和扩散长度

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摘要

Injection efficiency,eta_(inj),and diffusion length,L,in dye-sensitized solar cells have been derived from the spectral response(incident photon to current efficiency,IPCE)of the cells under front side or backside illumination.Values of L from IPCE are found to be ~2 times shorter than the values of L derived from the normal small perturbation transient method.IPCE-derived values of L(2 to more than 40 mu m)and eta_(inj)(63-90%)are found to correlate with the photocurrent(and indirectly with the photovoltage)of the different cells indicating the extent to which each factor limits the cell efficiency.IPCE spectra varied with light intensity,so that diffusion lengths derived from both methods show similar trends,e.g.,L from IPCE is found to increase 3 times when the light intensity is increased 10 times up to approximately 0.1 sun where L tends to plateau or peak.The values for eta_(inj)derived from the spectral response are shown to be in quantitative agreement with those determined from picosecond transient emission spectroscopy.To illustrate the utility of this method,L and eta_(inj)were measured on cells with and without the TiCU chemical bath treatment.The results show that the increase in photocurrent after the TiCU treatment is due to around a 2-fold increase in L despite a 3-fold reduction in the electron diffusion coefficient.The increased L can be explained by a factor of 10 decrease in electron recombination rate.
机译：染料敏化太阳能电池的注入效率eta_（inj）和扩散长度L是根据正面或背面照明下电池的光谱响应（入射光子对电流效率的入射光，IPCE）得出的。发现IPCE比普通小扰动瞬变法得出的L值短约2倍.IPCE得出的L（2到40微米以上）和eta_（inj）（63-90％）的值是发现与不同电池的光电流（并间接与光电压）相关，表明每个因素限制电池效率的程度.IPCE光谱随光强度变化，因此两种方法得出的扩散长度显示出相似的趋势，例如当光强度增加10倍达到大约0.1个太阳时，IPCE的L增加了3倍，其中L趋于平稳或达到峰值。由光谱响应得出的eta_（inj）值与那些决心m皮秒瞬态发射光谱法。为说明此方法的实用性，在有和没有TiCU化学浴处理的细胞上测量了L和eta_（inj）。结果表明，TiCU处理后光电流的增加是由于大约尽管电子扩散系数降低了3倍，但L却增加了2倍.L的增加可以解释为电子复合率降低10倍。

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