Voltage-Dependent Photoluminescence and How It Correlates with the Fill Factor and Open-Circuit Voltage in Perovskite Solar Cells,ACS Energy Letters

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Voltage-Dependent Photoluminescence and How It Correlates with the Fill Factor and Open-Circuit Voltage in Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-11-08 , DOI: 10.1021/acsenergylett.9b02262
Martin Stolterfoht ₁ , Vincent M. Le Corre ₂ , Markus Feuerstein ₁ , Pietro Caprioglio _{1,

3} , L. Jan Anton Koster ₂ , Dieter Neher ₁

Affiliation

Optimizing the photoluminescence (PL) yield of a solar cell has long been recognized as a key principle to maximize the power conversion efficiency. While PL measurements are routinely applied to perovskite films and solar cells under open-circuit conditions (V_OC), it remains unclear how the emission depends on the applied voltage. Here, we performed PL(V) measurements on perovskite cells with different hole transport layer thicknesses and doping concentrations, resulting in remarkably different fill factors (FFs). The results reveal that PL(V) mirrors the current–voltage (JV) characteristics in the power-generating regime, which highlights an interesting correlation between radiative and nonradiative recombination losses. In particular, high FF devices show a rapid quenching of PL(V) from open-circuit to the maximum power point. We conclude that, while the PL has to be maximized at V_OC, at lower biases < V_OC, the PL must be rapidly quenched as charges need to be extracted prior to recombination.

中文翻译：

钙钛矿型太阳能电池中随电压变化的光致发光及其与填充因子和开路电压的关系

长期以来，优化太阳能电池的光致发光（PL）产量一直被认为是最大化功率转换效率的关键原则。而PL测量常规应用于开路条件下（钙钛矿薄膜和太阳能电池V _OC），它的发射是如何依赖于所施加的电压仍不清楚。在这里，我们对具有不同空穴传输层厚度和掺杂浓度的钙钛矿电池进行了PL（V）测量，从而得出了显着不同的填充因子（FFs）。结果表明PL（V）反映了电流-电压（JV）的特征，突出了辐射与非辐射复合损失之间的有趣关系。特别地，高FF器件显示PL（V）从开路到最大功率点的快速淬灭。我们得出的结论是，尽管PL必须在V _OC处最大化，但在< V _OC的较低偏置下，由于必须在重组之前提取电荷，因此PL必须迅速淬灭。

更新日期：2019-11-11

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