TY - JOUR
T1 - Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy
AU - Feng, Jiangshan
AU - Zhu, Xuejie
AU - Yang, Zhou
AU - Zhang, Xiaorong
AU - Niu, Jinzhi
AU - Wang, Ziyu
AU - Zuo, Shengnan
AU - Priya, Shashank
AU - Liu, Shengzhong (Frank)
AU - Yang, Dong
N1 - Funding Information:
The authors acknowledge support from the National Key Research Program of China (Grant No. 2016YFA0202403), the National Natural Science Foundation of China (Grant No. 61604090/91733301), the National University Research Fund (Grant No. GK261001009), the Innovative Research Team (Grant No. IRT_14R33) the 111 Project (Grant No. B14041), the Shaanxi Technical Innovation Guidance Project (Grant No. 2018HJCG-17) and the Chinese National 1000-Talent-Plan program.
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/8/29
Y1 - 2018/8/29
N2 - Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F-PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F-PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb2+ to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F-PSCs. Meanwhile, the environmental stability of the F-PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F-PSCs for practical applications.
AB - Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F-PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F-PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb2+ to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F-PSCs. Meanwhile, the environmental stability of the F-PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F-PSCs for practical applications.
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U2 - 10.1002/adma.201801418
DO - 10.1002/adma.201801418
M3 - Article
C2 - 29995330
AN - SCOPUS:85050489267
SN - 0935-9648
VL - 30
JO - Advanced Materials
JF - Advanced Materials
IS - 35
M1 - 1801418
ER -