1. Ionic liquids tailoring crystal orientation and electronic properties for stable perovskite solar cells
- Author
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Zou, Yuqin, Eichhorn, Johanna, Rieger, Sebastian, Zheng, Yiting, Yuan, Shuai, Wolz, Lukas, Spanier, Lukas V., Heger, Julian E., Yin, Shanshan, Everett, Christopher R., Dai, Linjie, Schwartzkopf, Matthias, Mu, Cheng, Roth, Stephan V., Sharp, Ian D., Chen, Chun-Chao, Feldmann, Jochen, Stranks, Samuel D., Mueller-Buschbaum, Peter, Zou, Yuqin, Eichhorn, Johanna, Rieger, Sebastian, Zheng, Yiting, Yuan, Shuai, Wolz, Lukas, Spanier, Lukas V., Heger, Julian E., Yin, Shanshan, Everett, Christopher R., Dai, Linjie, Schwartzkopf, Matthias, Mu, Cheng, Roth, Stephan V., Sharp, Ian D., Chen, Chun-Chao, Feldmann, Jochen, Stranks, Samuel D., and Mueller-Buschbaum, Peter
- Abstract
The crystallization behavior of perovskite films has a profound influence on the resulting defect densities, charge carrier dynamics and photovoltaic performance. Herein, we introduce ionic liquids into the perovskite compo-nent to tailor the crystal growth of perovskite films from a disordered to a preferential corner-up orientation and accordingly increase the charge carrier mobility to accelerate electron transport and extraction. Using time-resolved measurements, we probe the charge carrier generation, transport and recombination behavior in these films and related devices. We find the ionic liquid-containing samples exhibit lower defects, faster charge carrier transport and suppressed non-radiative recombination, contributing to higher efficiency and fill factor. Via operando grazing-incidence small-and wide-angle X-ray scattering measurements, we observe a light-induced lattice compression and grain fragmentation in the control devices, whereas the ionic liquid-containing devices exhibit a slight light-induced crystal reconstitution and stronger tolerance against illumination. Under ambient conditions, the non-encapsulated device with the pyrrolidinium-based ionic compound (Pyr14BF4) maintains 97% of its initial efficiency after 4368 h., QC 20230613
- Published
- 2023
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