Improving the light-harvesting of amorphous silicon solar cells with photochemical upconversion
Improving the light-harvesting of amorphous silicon solar cells with photochemical upconversion
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DOI：
10.1039/c2ee21136j
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发表时间：
2012-05-01
影响因子：
32.5
通讯作者：
Schmidt, Timothy W.
中科院分区：
文献类型：
--
作者：
Cheng, Yuen Yap;Fueckel, Burkhard;Schmidt, Timothy W.
单阈值太阳能电池从根本上受到其仅收集高于一定能量的光子的能力的限制。因此，收集低于阈值的光子并以较短的波长重新辐射这种能量将提高这种设备的效率。我们报告了一种氢化非晶硅（a-Si：H）薄膜太阳能电池的光捕获效率的增加，由于后uppermance的基础上敏化三重态-三重态-湮灭在有机分子。由于非相干光化学过程，600-750 nm范围内的低能光被转换为550-600 nm的光。在相当于（48 +/- 3）suns（AM 1.5）的辐照下，在720 nm处测量到（1.0 +/- 0.2）%的峰值效率增强。我们讨论了适应光化学UC在各种单阈值器件中的应用所要探索的途径。
Single-threshold solar cells are fundamentally limited by their ability to harvest only those photons above a certain energy. Harvesting below-threshold photons and re-radiating this energy at a shorter wavelength would thus boost the efficiency of such devices. We report an increase in light harvesting efficiency of a hydrogenated amorphous silicon (a-Si: H) thin-film solar cell due to a rear upconvertor based on sensitized triplet-triplet-annihilation in organic molecules. Low energy light in the range 600-750 nm is converted to 550-600 nm light due to the incoherent photochemical process. A peak efficiency enhancement of (1.0 +/- 0.2)% at 720 nm is measured under irradiation equivalent to (48 +/- 3) suns (AM1.5). We discuss the pathways to be explored in adapting photochemical UC for application in various single threshold devices.