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[求助]
ZNO/聚合物制备光电器件
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The stability under strong sunlight and lifetime is also a critical parameter for polymer based solar cell, because polymer degra- dation takes place under strong sunlight, high temperature and some other side-reaction with metal electrode and water or oxygen. The different degradation and failure mechanism of poly- mer based are reviewed recently [32]. It is not viable to performthe stability and lifetime measurement for hundreds of hours. We can measure these under accelerated condition. The combination of oxygen atmosphere and illumination of PV devices with visible ight is a candidate for accelerated degradationmeasurement of the devices. In this work, we perform the stability test at ambient atmosphere under continuous illumination of white light. The Isc and Voc of the device as a function of illumination time are shown in Fig. 8. It is found that Voc of the device decreases to zero in 50 min under white-light illumination. The photosensitivity of ZnO to the ight could be one of the reasons to degrade the cell property [32].It has also been reported that hybrid bulk heterojunction of P3HT and ZnO nanoparticles increases the lifetime of the devices [34]. After prolong UV illumination, all electron traps are filled and excessive free electron causes the ZnO to attain the properties of a conductor and as a results photovoltaic behavior decreases. |
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sltmac
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【答案】应助回帖
夏露相随(金币+60, 翻译EPI+1): 很满意，谢谢啦 2011-07-12 10:14:40
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强太阳光下的稳定性以及使用寿命对聚合物基太阳能电池来说也是一个决定性的参数，这是因为聚合降解过程是在强太阳光、高温以及一些其它副反应下和金属电极、水或氧气作用下发生的。聚合物基太阳能电池的不同降解和失效机理近来也有研究。 对于花费数百个小时来测定其稳定性和使用寿命也是不可取的。我们在加速条件下测量了这些参数。器件的降解加速测试是在氧气氛围以及光伏器件可见光照射双重条件下完成的。本研究中，我们通过在白光源连续照射下在空气中对其稳定性进行了测试。图8是器件的Isc和Voc对光照时间的函数。我们发现，在白光源照射下，50分钟内器件的Voc降到零。ZnO的光敏性可能是降低该电池性能的原因之一。据报道，P3HT 和 ZnO纳米粒子形成的混合异质结能延长器件的使用寿命。延长紫外光照时间后，所以的电子阱都被填满，过剩的自由电子使得ZnO能获得导体的性能，导致的结果是光致电压的降低。 |
3楼2011-07-12 09:58:55
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