TY - JOUR
T1 - Uncovering synergistic effect of chloride additives for efficient quasi-2D perovskite solar cells
AU - Wang, Ze
AU - Liu, Li
AU - Liu, Xiaodong
AU - Song, Dandan
AU - Shi, Dong
AU - Wu, Shuanghong
AU - Tong, Yunwei
AU - Ren, Hui
AU - Li, Mingjie
AU - Zheng, Yonghao
AU - Zhao, Dewei
N1 - Funding Information:
This work was supported by the open research fund of Key Laboratory for Organic Electronics and Information Displays, the National Natural Science Foundation of China (No.: 61604101, 61805034, 61904152, and 62174112), and the Sichuan Science and Technology Program, China (Grant No. 2020YFG0038 and 2020JDJQ0030), National Key Research and Development Program of China (No. 2019YFE0120000), the Fundamental Research Funds for the Central Universities (no. YJ201955). M.L. acknowledges the financial support from the Hong Kong Polytechnic University (Grant No.1-BE2Z, W188 and 1-ZVGH).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/3/15
Y1 - 2022/3/15
N2 - Methylammonium chloride (MACl) and lead chloride (PbCl2) are commonly used for improving perovskite film quality. However, the rapid release of volatile MACl would lead to low-quality perovskite films with pinholes and defects. Here, we report a strategy of employing MACl&PbCl2 binary additives together to prepare high-quality quasi-two-dimensional (Q-2D) Ruddlesden–Popper (RP) perovskite films. We found that MAPbCl3 intermediate phase is formed via a reaction between MACl and PbCl2, which suppresses the fast volatilization of MACl, resulting in a compact and pinhole-free perovskite film with large grains. Moreover, the trap states are passivated via the incorporation of Cl– into the Q-2D perovskite crystals along with the addition of PbCl2, leading to a reduced charge recombination loss and an improved charge extraction. A remarkable power conversion efficiency (PCE) of 18.67% is achieved in such Q-2D RP PSCs, one of the highest PCE values among the low-dimensional RP PSCs with n ≤ 4. The environmental stability of the devices is also significantly enhanced. Our results provide an effective strategy by using chloride based additives for fabricating high-quality low-dimensional RP perovskite films for efficient solar cells.
AB - Methylammonium chloride (MACl) and lead chloride (PbCl2) are commonly used for improving perovskite film quality. However, the rapid release of volatile MACl would lead to low-quality perovskite films with pinholes and defects. Here, we report a strategy of employing MACl&PbCl2 binary additives together to prepare high-quality quasi-two-dimensional (Q-2D) Ruddlesden–Popper (RP) perovskite films. We found that MAPbCl3 intermediate phase is formed via a reaction between MACl and PbCl2, which suppresses the fast volatilization of MACl, resulting in a compact and pinhole-free perovskite film with large grains. Moreover, the trap states are passivated via the incorporation of Cl– into the Q-2D perovskite crystals along with the addition of PbCl2, leading to a reduced charge recombination loss and an improved charge extraction. A remarkable power conversion efficiency (PCE) of 18.67% is achieved in such Q-2D RP PSCs, one of the highest PCE values among the low-dimensional RP PSCs with n ≤ 4. The environmental stability of the devices is also significantly enhanced. Our results provide an effective strategy by using chloride based additives for fabricating high-quality low-dimensional RP perovskite films for efficient solar cells.
KW - Charge extraction
KW - Chloride additives
KW - Intermediate phase
KW - Passivation
KW - quasi-2D perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85121973598&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.134367
DO - 10.1016/j.cej.2021.134367
M3 - Journal article
AN - SCOPUS:85121973598
SN - 1385-8947
VL - 432
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 134367
ER -