Minimizing Current and Voltage Losses to Reach 25% Efficient Monolithic Two-Termina Perovskite-Silicon Tandem Solar Cells
Minimizing Current and Voltage Losses to Reach 25% Efficient Monolithic Two-Termina Perovskite-Silicon Tandem Solar Cells
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DOI：
10.1021/acsenergylett.8b01201
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发表时间：
2018-09-01
影响因子：
22
通讯作者：
McGehee, Michael D.
中科院分区：
文献类型：
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作者：
Bush, Kevin A.;Manzoor, Salman;McGehee, Michael D.
金属卤化物钙钛矿的效率和可调带隙的快速上升使它们在硅上的串联中的使用非常有吸引力。最近，我们展示了一个钙钛矿-硅单片双端串联23.6%的功率转换效率。在这里，我们提出了光学优化的工作，以提高光捕获，包括薄化顶部透明电极，以减少前表面反射和寄生吸收;引入金属指，以尽量减少串联电阻损耗;并进一步减少反射损耗与聚二甲基硅氧烷（PDMS）印章随机，金字塔纹理。此外，为了在实现电流匹配的同时降低电压损耗，我们采用聚[双（4-苯基）（2，4，6-三甲基苯基）胺]（PTAA）作为空穴传输材料代替NiOx和更宽的1.68 eV带隙钙钛矿组合物。这些优化将开路电压提高到1.77 V，短路电流密度提高到18.4 mA/cm（2），最终实现了具有1 cm（2）有源面积的25%效率的钙钛矿-硅串联。
The rapid rise in efficiency and tunable bandgap of metal-halide perovskites makes them highly attractive for use in tandems on silicon. Recently we demonstrated a perovskite-silicon monolithic two-terminal tandem with 23.6% power conversion efficiency. Here, we present work on optical optimization to improve light harvesting that includes thinning out the top transparent electrode to reduce front-surface reflection and parasitic absorption; introducing metal fingers to minimize series resistance losses; and further minimizing reflection loss with a polydimethylsiloxane (PDMS) stamp with random, pyramidal texture. Additionally, to reduce voltage loss while achieving current matching, we employ poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) as a hole transport material instead of NiOx and a wider 1.68 eV bandgap perovskite composition. These optimizations boost the open-circuit voltage to 1.77 V and the short-circuit current density to 18.4 mA/cm(2), culminating in a 25% efficient perovskite-silicon tandem with a 1 cm(2) active area.