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首页> 外文会议>European Photovoltaic Solar Energy Conference and Exhibition >ACTIVE-LAYER THICKNESS DEPENDENCE OF THE DEVICE PERFORMANCE OF PCDTBT:PCBM POLYMER SOLAR CELLS AND THEIR STABILITY
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ACTIVE-LAYER THICKNESS DEPENDENCE OF THE DEVICE PERFORMANCE OF PCDTBT:PCBM POLYMER SOLAR CELLS AND THEIR STABILITY

机译：PCDTBT：PCBM聚合物太阳能电池的器件性能与有源层厚度的关系及其稳定性

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The effect of active layer thickness on the performance of poly [N-9'-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole)] (PCDTBT) and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) based solar cells was investigated. The active layer thickness of devices were varied following the approach of layer by layer growth. The cells were fabricated on an indium tin oxide (ITO)-coated glass substrate bearing the structure: ITO /poly(3,4- ethylene-dioxythiophene) (PEDOT:PSS)/PCDTBT:PC71BM/Al. It has been observed that the open circuit voltage (V_(oc)) gradually increases from 0.52 V for a single layer device to 0.80 V for a multilayer (5 layers) device. However, the short circuit current density (Jsc) is found to decrease from 17.33 mA/cm~2 to 7.51 mA/cm~2. Due to this reduction in current density the efficiency of multilayer devices is reduced down to 1.53% from 3.55% under 1 Sun illumination. The intensity variation experiments suggested that Jsc is monotonously increasing with the increase in input power and maintains a constant V_(oc) value. It has been inferred that that Jsc is not limited due to external fields but a pronounced recombination process is hindering a significant fraction of the separated charge to reach to respective electrodes. The device performance was significantly improved by thermal annealing of multilayered solar cells and an efficiency of 2.5 % was attained back.
机译：活性层厚度对聚[N-9'-庚-癸基-2,7-咔唑-alt-5,5-（40,70-di-2-thienyl-20,10,30-研究了[苯并噻二唑]]（PCDTBT）和基于[6,6]-苯基C71-丁酸甲酯（PC71BM）的太阳能电池。器件的有源层厚度随逐层生长的方法而变化。电池是在带有氧化铟锡（ITO）的玻璃基板上制成的，该玻璃基板的结构为：ITO /聚（3,4-乙烯-二氧噻吩）（PEDOT：PSS）/ PCDTBT：PC71BM / Al。已经观察到开路电压（V_（oc））从单层器件的0.52V逐渐增加到多层（5层）器件的0.80V。然而，发现短路电流密度（Jsc）从17.33mA / cm〜2降低到7.51mA / cm〜2。由于电流密度的这种降低，多层器件的效率从1阳光照射下的3.55％降低到1.53％。强度变化实验表明，Jsc随着输入功率的增加而单调增加，并保持恒定的V_（oc）值。已经推断出Jsc不受外部电场的限制，但是明显的重组过程阻碍了大部分分离的电荷到达各个电极。通过对多层太阳能电池进行热退火，可以显着提高器件性能，并获得2.5％的效率。

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