Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy.
Operando dynamics of trapped carriers in perovskite solar cells observed via infrared optical activation spectroscopy.
复制标题
通过红外光学激活光谱观察到的钙钛矿太阳能电池中的载流子的操作动力学。
DOI：
10.1038/s41467-023-43852-5
复制
发表时间：
2023-12-04
影响因子：
16.6
通讯作者：
Bakulin, Artem A.
中科院分区：
文献类型：
--
作者：
Pan, Jiaxin;Chen, Ziming;Zhang, Tiankai;Hu, Beier;Ning, Haoqing;Meng, Zhu;Su, Ziyu;Nodari, Davide;Xu, Weidong;Min, Ganghong;Chen, Mengyun;Liu, Xianjie;Gasparini, Nicola;Haque, Saif A.;Barnes, Piers R. F.;Gao, Feng;Bakulin, Artem A.
传统的光谱学没有足够的选择性来全面了解钙钛矿太阳能电池中捕获的载流子的行为，特别是在其工作条件下。在这里，我们使用红外光学活化光谱（即，泵浦-推动-光电流），以观察操作钙钛矿太阳能电池内捕获的载流子的性质和实时动力学。我们比较了原始和表面钝化的FA0.99Cs0.01PbI3器件中被困空穴的行为差异，使用准稳态和纳秒时间分辨泵浦推光电流的组合，以及动力学和漂移扩散模型。我们发现了一个两步陷阱填充过程：在钙钛矿体中快速填充（~10 ns）低密度陷阱，然后在钙钛矿/空穴传输材料界面处缓慢填充（~100 ns）高密度陷阱。正辛基碘化铵的表面钝化大大减少了陷阱态的数量（约50倍），大大提高了器件的性能。此外，激活能（~280毫电子伏）的主要空穴陷阱保持类似的表面钝化和不钝化。传统的光谱技术没有足够的选择性来跟踪工作的钙钛矿太阳能电池中捕获的载流子的动力学。在这里，作者使用红外光学激活光谱观察真实的时间演化的陷阱载流子和比较的行为陷阱空穴。
Conventional spectroscopies are not sufficiently selective to comprehensively understand the behaviour of trapped carriers in perovskite solar cells, particularly under their working conditions. Here we use infrared optical activation spectroscopy (i.e., pump-push-photocurrent), to observe the properties and real-time dynamics of trapped carriers within operando perovskite solar cells. We compare behaviour differences of trapped holes in pristine and surface-passivated FA0.99Cs0.01PbI3 devices using a combination of quasi-steady-state and nanosecond time-resolved pump-push-photocurrent, as well as kinetic and drift-diffusion models. We find a two-step trap-filling process: the rapid filling (~10 ns) of low-density traps in the bulk of perovskite, followed by the slower filling (~100 ns) of high-density traps at the perovskite/hole transport material interface. Surface passivation by n-octylammonium iodide dramatically reduces the number of trap states (~50 times), improving the device performance substantially. Moreover, the activation energy (~280 meV) of the dominant hole traps remains similar with and without surface passivation. Conventional spectroscopic techniques are not sufficiently selective to follow the dynamics of trapped carriers in working perovskite solar cells. Here, authors use infrared optical activation spectroscopy to observe real time evolution of trapped carriers and compare the behaviour of trapped holes.
登录
查看更多内容
影响因子：
5.9
作者：
El-Zohry, Ahmed M.;Turedi, Bekir;Alsalloum, Abdullah;Maity, Partha;Bakr, Osman M.;Ooi, Boon S.;Mohammed, Omar F.
通讯作者：
Mohammed, Omar F.
影响因子：
56.7
作者：
Guo, Renjun;Han, Dan;Muller-Buschbaum, Peter
通讯作者：
Muller-Buschbaum, Peter
具有相干 2D/3D 界面的稳定锡/铅基钙钛矿太阳能电池
影响因子：
5.8
作者：
Chen Z;Liu M;Li Z;Shi T;Yang Y;Yip HL;Cao Y
通讯作者：
Cao Y
影响因子：
7.9
作者：
Chen, Sheng;Wen, Xiaoming;Ho-Baillie, Anita
通讯作者：
Ho-Baillie, Anita
影响因子：
17.1
作者：
Bakulin, Artem A.;Neutzner, Stefanie;Chen, Zhuoying
通讯作者：
Chen, Zhuoying