Optical design of perovskite solar cells for applications in monolithic tandem configuration with CuInSe2 bottom cells
Optical design of perovskite solar cells for applications in monolithic tandem configuration with CuInSe2 bottom cells
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DOI：
10.1557/adv.2018.464
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发表时间：
2018-01-01
期刊：
影响因子：
0.8
通讯作者：
Heben, Michael J.
中科院分区：
文献类型：
--
作者：
Ahangharnejhad, Ramez H.;Song, Zhaoning;Heben, Michael J.
由高带隙钙钛矿顶部电池和低带隙薄膜底部电池组成的单片集成薄膜叠层太阳能电池预计将达到更高的功率转换效率（PCE），并且制造成本和环境影响低于市场主导的晶体硅光致发光材料。已经有几个具有CuInGaSe 2（CIGS）或CuInSe 2（CIS）的4端和2端钙钛矿串联器件的演示。类似于其它串联结构。该器件的优化依赖于对钙钛矿带隙和厚度的最佳选择。因此，通过调整钙钛矿吸收剂以最大化受电流匹配条件限制的光电流，将能够实现进一步的进步。在这里，我们系统地研究了具有不同吸收带隙的钙钛矿薄膜的光吸收和透射。基于这些结果，我们模拟了钙钛矿和CIS子电池中的光电流生成，并通过考虑理想功能的钙钛矿和CIS器件来估计预计的串联器件的性能。我们的结果表明，对于厚度为500 nm的钙钛矿层，最佳带隙约为1.6 eV。通过这些配置，可以通过单片集成的钙钛矿/CIS串联太阳能电池实现20%以上的PCE。此外，通过对每一层的吸收进行建模，除了跟踪光损耗之外，我们还计算了每个子电池的量子效率。
Monolithic integrated thin film tandem solar cells consisting of a high bandgap perovskite top cell and a low bandgap thin film bottom cell are expected to reach higher power conversion efficiencies (PCEs) with lower manufacturing cost and environmental impacts than the market-dominant crystalline silicon photovoltaics. There have been several demonstrations of 4-terminal and 2-terminal perovskite tandem devices with CuInGaSe2 (CIGS) or CuInSe2 (CIS) and. similar to the other tandem structures. the optimization of this device relies on optimal choice for the perovskite bandgap and thickness. Therefore, further advancement will be enabled by tuning the perovskite absorber to maximize the photocurrent limited by the current match condition. Here, we systematically study the optical absorption and transmission of perovskite thin films with varying absorber bandgap. Based on these results, we model the photocurrent generations in both perovskite and CIS subcells and estimate the performances of projected tandem devices by considering the ideally functioning perovskite and CIS device. Our results show that for perovskite layers with 500 nm thickness the optimal bandgap is around 1.6 eV. With these configurations, PCEs above 20% could be achieved by monolithically integrated perovskite/CIS tandem solar cells. Also by modelling the absorption at every layer we calculate the quantum efficiency at each subcell in addition to tracking optical losses.