Affiliation:
1. Department of Materials Science and Engineering Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and Technology Shenzhen 518055 China
2. College of New Energy Ningbo University of Technology Ningbo 315336 China
3. Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou 510632 China
Abstract
AbstractPb–Sn mixed inorganic perovskite solar cells (PSCs) have garnered increasing interest as a viable solution to mitigate the thermal instability and lead toxicity of hybrid lead‐based PSCs. However, the relatively poor structural stability and low device efficiency hinder its further development. Herein, high‐performance manganese (Mn)‐doped Pb–Sn–Mn‐based inorganic perovskite solar cells (PSCs) are successfully developed by introducing Benzhydroxamic Acid (BHA) as multifunctional additive. The incorporation of smaller divalent Mn cations contributes to a contraction of the perovskite crystal, leading to an improvement in structural stability. The BHA additive containing a reductive hydroxamic acid group (O═C–NHOH) not only mitigates the notorious oxidation of Sn2+ but also interacts with metal ions at the B‐site and passivates related defects. This results in films with high crystallinity and low defect density. Moreover, the BHA molecules tend to introduce a near‐vertical dipole moment that parallels the built‐in electric field, thus facilitating charge carrier extraction. Consequently, the resulting device delivers a champion PCE as high as 17.12%, which represents the highest reported efficiency for Pb–Sn‐based inorganic PSCs thus far. Furthermore, the BHA molecule provides an in situ encapsulation of the perovskite grain boundary, resulting in significant enhancement of device air stability.
Funder
National Natural Science Foundation of China
Shenzhen Knowledge Innovation Program
National Key Research and Development Program of China
Leading Talents Program of Guangdong Province
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science