Prof. Hyun Suk Jung and Prof. Jai Chan Lee’s research team develops highly efficient halide perovskite solar cell modules fabrication technology using Formamidine disulfide oxidant > News

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Prof. Hyun Suk Jung and Prof. Jai Chan Lee’s research team develops hi…

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댓글 0건 조회 35회 작성일 21-09-24 11:46


Prof. Hyun Suk Jung and Prof. Jai Chan Lee’s research team develops
highly efficient halide perovskite solar cell modules fabrication technology 
using Formamidine disulfide oxidant

- Suggesting a new approach for high-efficiency, high-stability large-area solar cell modules for commercialization of perovskite solar cells


[Figure 1]  Prof. Hyun Suk Jung, Prof. Jai Chan Lee, and Prof. Tae Kyu Ahn (Department of Energy Science)


Prof. Hyun Suk Jung (Co-first author: Ph.D. student Jun Zhu), Prof. Jai Chan Lee (Co-first author: Combined program student Seul Young Park)'s research team, in tandem with Prof. Tae Kyu Ahn(Department of energy science) developed a new technology that increases the energy conversion efficiency of solar cell modules by applying strong oxidant into halide perovskite materials.


Halide perovskites are an ideal solar cell material that exhibits high light absorption, long diffusion lengths of the photoetched electron, and holes. Recently, the solar cells that applied halide perovskites are getting greater attention than the existing ones, showing higher power conversion efficiency.


However, primary intrinsic defects in FAPbI3 (i.e., iodine vacancy) induce strong electron localization and become deep traps and recombination centers upon photoexcitation. Consequently, the carrier lifetime is significantly reduced, and the superior properties are not fully utilized.


The research team used formamidine disulfide dihydrochloride (FASCl) to remove the localized electrons on the perovskite defects. FAS2+ ion, as a strong oxidant as well as electron scavenger, takes other materials’ localized electrons and oxidize.

[Figure 2] (1) Schematic diagrams of the introduction of the recombination center in the band gap of FAPbI3 by the localized charge in the iodine vacancy. (2) Schematic diagrams of the suppression of electron localization in the iodine vacancy by the FAS2+ ion in FAPbI3 

Applying the first-principle method, the research team revealed that formamidine disulfide ion prevents the formation of the defect complex by stably integrating into perovskite structure and making the iodine vacancy lose the strongly localized electrons. The research team demonstrated an increased carrier lifetime of electrons and holes on the fabricated perovskite
structure based on this strategy.


In addition, the introduced formamidine disulfide interacted with the perovskite precursor and formatted an intermediate, which can improve perovskite crystallinity, grain size and thus enhance the device's performance and stability. 


[Figure 3] (Image 3) is a solar cell module manufactured using perovskite to which formalamide disulfide is added. (Image 4) solar cell modules exhibiting very high energy conversion efficiency in Large-area.

"Solar cells using perovskite with formamidine disulfide ions showed excellent efficiency of more than 20% in large solar cell modules as well as unit cells. We expect this study to present a new approach for the commercialization of perovskite solar cells in near future." The research team said.


This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (No. 2019R1A2C2002661), the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) (No. 2020-0-00541, Flexible Photovoltaic Device Module with Autonomous Power Supply for Smart Farm Wireless Composite IoT Sensor), Creative Materials Discovery Program through the National Research Foundation of Korea (NRF-2019M3D1A1078296 and NRF-2019M3D1A2104108) funded by the Ministry of Science and ICT, and the Basic Research Lab Program (2020R1A4A2002161) through the National Research Foundation of Korea. Computational resources were supported by KISTI supercomputing center (KSC-2020-CRE-0028).


The research process was published on the Energy & Environmental science (IF 38.532) on July 30th (2021).    ※ Paper title : Formamidine disulfide oxidant as a localised electron scavenger for >20% perovskite solar cell modules



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