Simultaneous measurement of photocurrent and recombination emission in organic solar cell
Simultaneous measurement of photocurrent and recombination emission in organic solar cell
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DOI：
10.35848/1347-4065/ac4051
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发表时间：
2021-06
影响因子：
1.5
通讯作者：
Ji-Hyun Lee;M. Hiramoto;S. Izawa
中科院分区：
文献类型：
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作者：
Ji-Hyun Lee;M. Hiramoto;S. Izawa
电荷转移（CT）状态是理解有机太阳能电池（OSCs）中复合过程的关键中介。在本研究中，我们测量了OSCs中不同外加电压和同时流过电路的光电流密度下CT态的复合发射。我们提出了一个“光致发光(PL) -电压(V)图”，即CT状态下PL强度的电压依赖性。PL-V图仅包括供体/受体界面CT状态重组的信息，并与评估osc最重要的信息“电流密度(J) -V图”相补充。结果表明，PL-V图的填充因子（FF）高于J-V图的填充因子（FF），可以预测器件的理想FF。我们的结果表明，同时测量光电流和复合发射可以作为评估光转换特性的有力工具。
Charge transfer (CT) state is a key intermediate to understand recombination processes in organic solar cells (OSCs). In this study, we measured the recombination emission from the CT state under different applied voltages in OSCs and a photocurrent density flowing on the circuit simultaneously. We proposed a “photoluminescence (PL)–voltage (V) plot” that is the voltage dependence of PL intensity of the CT state. The PL–V plot includes information only from the CT state recombination at the donor/acceptor interface and is complementary to the “current density (J)–V plot” that is the most important information for evaluating OSCs. The results demonstrated that the fill factor (FF) of the PL–V plot is higher than that of the J–V plot, predicting the ideal FF of the device. Our result demonstrated that the simultaneous measurement of photocurrent and recombination emission could be a strong tool for evaluating photoconversion characteristics in OSCs.