Affiliation:
1. Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 P. R. China
2. Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 P. R. China
Abstract
AbstractTin‐based perovskite solar cells (TPSCs) have become a star candidate in lead‐free perovskite cells due to their excellent optoelectronic properties and low toxicity. However, there are a lot of problems such as uncontrollable crystallizationprocess, easy oxidation of Sn2+ and high defect density have not been completely resolved in TPSCs. Here, the thiourea (TU) and amidine thiourea (ASU) are added into the perovskite precursor to regulate the microstructure, inhibit the oxidation of Sn2+ and promote charge transfer. The characterization results demonstrate that the TU additive can not only improve the micrograph, crystallinity and antioxidant, but also significantly induce recrystallization and passivate trap states. Thus, the TPSCs with TU (TU‐modified TPSCs) show a significantly higher power conversion efficienc (PCE) and better stability than those of the TPSCs with ASU (ASU‐modified PSCs) and reference TPSCs. After stored in N2 atmosphere for 8 months, the unencapsulated TU‐modified PSCs achieve a champion PCE of 10.9% with an open‐circuit voltage of 0.79 V. Furthermore, the unsealed TU‐modified PSCs can maintain 115% of its initial efficiency after stored in N2 atmosphere for one year. This is the longest lifetime of unencapsulated pure TPSCs in N2 atmosphere.
Funder
Guangdong Provincial Engineering Technology Research Center for Transparent Conductive Materials
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
11 articles.
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