Efficient energy transfer mitigates parasitic light absorption in molecular charge-extraction layers for perovskite solar cells.
Efficient energy transfer mitigates parasitic light absorption in molecular charge-extraction layers for perovskite solar cells.
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DOI：
10.1038/s41467-020-19268-w
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发表时间：
2020-11-02
影响因子：
16.6
通讯作者：
Herz LM
中科院分区：
文献类型：
--
作者：
Eggimann HJ;Patel JB;Johnston MB;Herz LM
有机半导体通常用作金属卤化物钙钛矿太阳能电池中的电荷提取层。然而，太阳光在到达钙钛矿层之前必须传播通过的面向太阳的前分子层中的寄生光吸收可能降低这种器件的功率转换效率。在这里，我们表明，这样的损失可以通过有效的激发能量转移从光激发的聚合物层到下面的钙钛矿消除。实验观察到的一系列不同的聚合物膜和甲基铵碘化铅钙钛矿层之间的能量转移被用作建模的基础，作为层厚度，光致发光量子效率和有机聚合物膜的吸收系数的函数的机制的功效。我们的研究结果表明，有效的能量转移可以实现薄（≤10 nm）的有机电荷提取层表现出高的光致发光量子效率。我们进一步探讨了这种薄聚合物层的形态如何受到与钙钛矿的界面形成的影响。钙钛矿太阳能电池的性能可能受到有机电荷提取层中的光吸收损失的限制，太阳光在到达钙钛矿之前必须通过有机电荷提取层传播。在这里，作者证明了从薄有机层到钙钛矿层的有效能量转移能够消除这种寄生损失。
Organic semiconductors are commonly used as charge-extraction layers in metal-halide perovskite solar cells. However, parasitic light absorption in the sun-facing front molecular layer, through which sun light must propagate before reaching the perovskite layer, may lower the power conversion efficiency of such devices. Here, we show that such losses may be eliminated through efficient excitation energy transfer from a photoexcited polymer layer to the underlying perovskite. Experimentally observed energy transfer between a range of different polymer films and a methylammonium lead iodide perovskite layer was used as basis for modelling the efficacy of the mechanism as a function of layer thickness, photoluminescence quantum efficiency and absorption coefficient of the organic polymer film. Our findings reveal that efficient energy transfer can be achieved for thin (≤10 nm) organic charge-extraction layers exhibiting high photoluminescence quantum efficiency. We further explore how the morphology of such thin polymer layers may be affected by interface formation with the perovskite. The performance of perovskite solar cells can be limited by light absorption loss in organic charge extraction layers, through which sun light must propagate before reaching the perovskite. Here, the authors demonstrate that efficient energy transfer to the perovskite layer from a thin organic layer is able to eliminate this parasitic loss.
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影响因子：
3.7
作者：
Gong, Juliane Q.;Parkinson, Patrick;Kondratuk, Dmitry V.;Gil-Ramirez, Guzman;Anderson, Harry L.;Herz, Laura M.
通讯作者：
Herz, Laura M.
影响因子：
4.6
作者：
Cho, Il-Wook;Ryu, Mee-Yi
通讯作者：
Ryu, Mee-Yi
影响因子：
8.6
作者：
Clark, Jenny;Silva, Carlos;Spano, Frank C.
通讯作者：
Spano, Frank C.
影响因子：
16.6
作者：
Eames, Christopher;Frost, Jarvist M.;Barnes, Piers R. F.;O'Regan, Brian C.;Walsh, Aron;Islam, M. Saiful
通讯作者：
Islam, M. Saiful
影响因子：
4.6
作者：
Ehrenreich P;Birkhold ST;Zimmermann E;Hu H;Kim KD;Weickert J;Pfadler T;Schmidt-Mende L
通讯作者：
Schmidt-Mende L