Additive Engineering of Sn-based Perovskites for Efficient Pb-free Solar Cells
Seojun Lee a, Saemon Yoon a, Jun Ryu a, Dong-Won Kang a
a School of Energy Systems Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Poster, Seojun Lee, 089
Publication date: 14th October 2019

Recently, the perovskite solar cells have been in the spotlight for next generation solar cells as the conversion efficiency is over 25%. This is comparable to that of silicon solar cells during short period of studies. However, toxicity of lead (Pb) is a major obstacle for the commercialization of perovskite solar cells.

In this work, Sn-based PEAxFA1-xSnI3 perovskites were developed using additives of phenethylammonium iodide (PEAI) and SnF2 for device application in inverted structure (ITO/PEDOT:PSS/Perovskite/PCBM/Ag). We measured absorbance and steady-state photoluminescence measurements to investigate optical properties of PEAxFA1-xSnI3 perovskites and showed the perovskite films with narrow bandgaps about 1.36 ~ 1.38eV. In addition, the amounts of PEAI as mixed cation and tin fluoride (SnF2) to inhibit oxidation of Sn2+ were optimized by measuring the performances of each devices. By introducing optimized PEAI of 15% and SnF2 of 20%, the power conversion efficiency was improved from 3.65% for pristine FASnI3 device to 5.25% for PEAxFA1-xSnI3 device. Furthermore, the stability was maintained at 98% of the initial efficiency after 7 days without encapsulation. Afterward, enhanced performance will be achieved by optimizing the interfaces between charge transport layers and perovskites. These results could promote the development of eco-friend and non-toxic perovskite solar cells.

This work was partly supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20193091010160, Development of 3D eyed transparent inorganic photovoltaic module) and supported by National Research Foundation of Korea (NRF) grants funded by the Korean government (MSIT) (NRF- 2018R1C1B6008028, 2019K2A9A2A08000132).

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