TY - JOUR
T1 - Room Temperature Formation of Semiconductor Grade α-FAPbI3 Films for Efficient Perovskite Solar Cells
AU - Chen, Zhiliang
AU - Zhang, Hengkai
AU - Yao, Fang
AU - Tao, Chen
AU - Fang, Guojia
AU - Li, Gang
N1 - Funding Information:
This work was financially supported by the Research Grants Council of Hong Kong (GRF grant 15246816 and CRF grant C5037-18G), the Project of Strategic Importance (project code 1-ZE29) and the Sir Sze-yuen Chung Endowed Professorship fund provided by the Hong Kong Polytechnic University, the Shenzhen Science and Technology Innovation Commission (project no. JCYJ20170413154602102), the National Natural Science Foundation of China (11674252), Special Funds for the Development of Strategic Emerging Industries in Shenzhen (JCYJ20170818113036217), the Science and Technology Department of Hubei Province (2019AAA020), and the Fundamental Research Funds for the Central Universities (2042019kf0317). Z.C. thanks Dr. Wei Yu for helping with the experiments and for valuable discussions. Z.C. G.F. and G.L. designed all of the experiments. Z.C. fabricated and performed the main characterization of thin films and solar cells. H.Z. synthesized the SnO2 nanoparticles and measured the stabilized PCE. F.Y. performed the EDS and IPCE measurements. Z.C. drafted the manuscript, guided by G.L. C.T. and G.L. assisted in revising the manuscript. G.F. and G.L. supervised the whole project. The authors declare no competing interests.
Funding Information:
This work was financially supported by the Research Grants Council of Hong Kong (GRF grant 15246816 and CRF grant C5037-18G ), the Project of Strategic Importance (project code 1-ZE29 ) and the Sir Sze-yuen Chung Endowed Professorship fund provided by the Hong Kong Polytechnic University , the Shenzhen Science and Technology Innovation Commission (project no. JCYJ20170413154602102 ), the National Natural Science Foundation of China ( 11674252 ), Special Funds for the Development of Strategic Emerging Industries in Shenzhen ( JCYJ20170818113036217 ), the Science and Technology Department of Hubei Province ( 2019AAA020 ), and the Fundamental Research Funds for the Central Universities ( 2042019kf0317 ). Z.C. thanks Dr. Wei Yu for helping with the experiments and for valuable discussions.
Publisher Copyright:
© 2020 The Authors
PY - 2020/9/23
Y1 - 2020/9/23
N2 - Formamidinium lead iodide (FAPbI3) perovskite is a front-runner material for efficient perovskite solar cells (PSCs) due to its high light-absorption coefficient, narrow band gap, and superior photostability and thermostability. High-quality FAPbI3 perovskite formation typically requires an >160°C annealing process to induce phase transition from the photoinactive yellow phase (δ-FAPbI3) to the photoactive black phase (α-FAPbI3). However, this high-temperature annealing can induce defects in the films and hinders application in flexible solar cells. Here, we report a facile method to fabricate high-quality α-FAPbI3 perovskite films at room temperature, without thermal annealing or vacuum-assisted processes. Combined computational and experimental results reveal the crystallization mechanism of α-FAPbI3 formation at room temperature. We demonstrate PSCs with a power-conversion efficiency of 19.09%, which is the highest efficiency for room temperature PSCs to the best of our knowledge. This study may offer a cost-effective way to fabricate highly efficient PSCs at room temperature. α-FAPbI3 is a front-runner perovskite material for highly efficient solar cells, although its preparation typically requires high-temperature annealing. Chen et al. report a facile method for fabricating high-quality α-FAPbI3 films at room temperature and reveal the mechanism of the formation of α-FAPbI3 through theoretical and experimental methods.
AB - Formamidinium lead iodide (FAPbI3) perovskite is a front-runner material for efficient perovskite solar cells (PSCs) due to its high light-absorption coefficient, narrow band gap, and superior photostability and thermostability. High-quality FAPbI3 perovskite formation typically requires an >160°C annealing process to induce phase transition from the photoinactive yellow phase (δ-FAPbI3) to the photoactive black phase (α-FAPbI3). However, this high-temperature annealing can induce defects in the films and hinders application in flexible solar cells. Here, we report a facile method to fabricate high-quality α-FAPbI3 perovskite films at room temperature, without thermal annealing or vacuum-assisted processes. Combined computational and experimental results reveal the crystallization mechanism of α-FAPbI3 formation at room temperature. We demonstrate PSCs with a power-conversion efficiency of 19.09%, which is the highest efficiency for room temperature PSCs to the best of our knowledge. This study may offer a cost-effective way to fabricate highly efficient PSCs at room temperature. α-FAPbI3 is a front-runner perovskite material for highly efficient solar cells, although its preparation typically requires high-temperature annealing. Chen et al. report a facile method for fabricating high-quality α-FAPbI3 films at room temperature and reveal the mechanism of the formation of α-FAPbI3 through theoretical and experimental methods.
KW - formamidinium lead iodide
KW - Intermediate Phase
KW - low bandgap
KW - perovskite solar cell
KW - Room Temperature Perovskite Formation
KW - α-FAPbI
UR - http://www.scopus.com/inward/record.url?scp=85098143922&partnerID=8YFLogxK
U2 - 10.1016/j.xcrp.2020.100205
DO - 10.1016/j.xcrp.2020.100205
M3 - Journal article
AN - SCOPUS:85098143922
SN - 2666-3864
VL - 1
JO - Cell Reports Physical Science
JF - Cell Reports Physical Science
IS - 9
M1 - 100205
ER -