Effect of bending test on the performance of CdTe solar cells on flexible ultra-thin glass produced by MOCVD
Effect of bending test on the performance of CdTe solar cells on flexible ultra-thin glass produced by MOCVD
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DOI：
10.1016/j.solmat.2020.110552
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发表时间：
2020-07
影响因子：
6.9
通讯作者：
A. Teloeken;D. Lamb;T. Dunlop;Stuart Irvine
中科院分区：
文献类型：
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作者：
A. Teloeken;D. Lamb;T. Dunlop;Stuart Irvine
轻量化和柔性太阳能模块的发展是高特定功率应用，建筑集成光伏，无人驾驶飞行器和空间的高度期望。柔性金属箔和聚酰亚胺箔经常被使用，但在这项工作中，超薄玻璃（UTG）已被采用。在厚度为100 μm的UTG上制备出了平均效率达14.7% （AM1.5G）的CdTe太阳能电池。很少有关于弯曲对PV性能影响的报道，因此我们研究了在40 mm和32 mm弯曲半径下进行测量以及在弯曲曲率施加之前和之后的平面状态下对J-V参数的影响。经过32 mm弯曲测试后的平面J-V测量结果表明，效率、Voc和FF都有一定的提高，其值高于平面状态下的第一次测量值。另外，对两种初始性能相同的CdTe太阳能电池进行了168h的32 mm静态弯曲试验，结果显示均匀性和稳定性良好，J-V参数无明显变化。进行了外部量子效率和电容电压测量，发现光谱响应和载流子浓度没有显著变化。残余应力分析表明，弯曲试验后膜内未产生额外应变，整体应变较低。这证明了在UTG上使用CdTe太阳能电池在新应用中的可行性，当需要弯曲模块而不影响性能时。
The development of lightweight and flexible solar modules is highly desirable for high specific power applications, building integrated photovoltaics, unmanned aerial vehicles and space. Flexible metallic and polyimide foils are frequently used, but in this work an alternative substrate with attractive properties, ultra-thin glass (UTG) has been employed. CdTe solar cells with average efficiency reaching 14.7% AM1.5G efficiency have been produced on UTG of 100 μm thickness. Little has been reported on the effects on PV performance when flexed, so we investigated the effects on J-V parameters when the measurements were performed in 40 mm and 32 mm bend radius, and in a planar state before and after the bend curvature was applied. The flat J-V measurements after 32 mm bending test showed some improvement in efficiency, Voc and FF, with values higher than the first measurement in a planar state. In addition, two CdTe solar cells with identical initial performance were subjected to 32 mm static bending test for 168 hours, the results showed excellent uniformity and stability and no significant variation on J-V parameters was observed. External quantum efficiency and capacitance voltage measurements were performed and showed no significant change in spectral response or carrier concentration. Residual stress analysis showed that no additional strain was induced within the film after the bending test and that the overall strain was low. This has demonstrated the feasibility of using CdTe solar cells on UTG in new applications, when a curved module is required without compromising performance.