TY - JOUR
T1 - Ionic liquids tailoring crystal orientation and electronic properties for stable perovskite solar cells
AU - Zou, Yuqin
AU - Eichhorn, Johanna
AU - Rieger, Sebastian
AU - Zheng, Yiting
AU - Yuan, Shuai
AU - Wolz, Lukas
AU - Spanier, Lukas V.
AU - Heger, Julian E.
AU - Yin, Shanshan
AU - Everett, Christopher R.
AU - Dai, Linjie
AU - Schwartzkopf, Matthias
AU - Mu, Cheng
AU - Roth, Stephan V.
AU - Sharp, Ian D.
AU - Chen, Chun Chao
AU - Feldmann, Jochen
AU - Stranks, Samuel D.
AU - Müller-Buschbaum, Peter
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/7
Y1 - 2023/7
N2 - 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 component 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.
AB - 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 component 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.
KW - Charge carrier kinetics
KW - Crystal orientation
KW - GIWAXS, GISAXS
KW - Perovskite solar cells
KW - Stability
UR - http://www.scopus.com/inward/record.url?scp=85153084261&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2023.108449
DO - 10.1016/j.nanoen.2023.108449
M3 - Article
AN - SCOPUS:85153084261
SN - 2211-2855
VL - 112
JO - Nano Energy
JF - Nano Energy
M1 - 108449
ER -
