"Room temperature processable high-efficient inverted perovskite solar cells"

Ahra Yi a,b,1, Sangmin Chae a,b,1, Hoang Mai Luong a, Sung Hun Lee b, Hanbin Lee b, Haeun Yoon b, Do–Hyung Kim c*, Hyo Jung Kim b**, Thuc-Quyen Nguyen a***

aCenter for Polymers and Organic Solids (CPOS) and Department of Chemistry & Biochemistry, University of California, Santa Barbara, CA, 93106
bDepartment of Organic Material Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, 46241
cNew and Renewable Energy Lab, Korea Electric Power Research Institute, Daejeon, 34056, Republic of Korea

            In recent years, metal-halide perovskites have emerged as highly promising semiconductor materials for various photovoltaic and photoelectronic applications, including light-emitting diodes (LEDs), lasers, photodetectors, and solar cells.[1-3] Notably, Formamidinium lead iodide (FAPbI3) stands out among perovskite materials due to its exceptional absorption coefficient and an ideal band gap of 1.48 eV, closely approaching the Shockley-Queisser limit.[1-3]

            Despite its superior potential, challenges such as poor phase stability and difficulties in crystallizing α-FAPbI3 have hindered its broader adoption for universal applications. Additionally, the commonly employed high-annealing temperature (> 150°C) for FAPbI3 poses limitations on its applicability and choice of compatible substrates.

            To overcome these challenges, researchers have developed composition engineering techniques aimed at enhancing the stability and optimizing the optoelectronic properties of perovskite materials. Recent studies report significant progress in improving solar cell efficiencies through the use of multicomponent perovskites.[4-5]

            In this study, we employ composition engineering to demonstrate a room-temperature processing technique for highly efficient inverted PSCs. This approach not only addresses the challenges associated with structural stability but also expands the range of compatible substrates for PSC fabrication. Our innovative approach provides a comprehensive understanding of the system by thoroughly investigating its physical and electronic properties.

References:

  1. J. Huang, Y. Yuan, Y. Shao, and Y. Yan. Understanding the physical properties of hybrid perovskites for photovoltaic applications. Nat Rev Mater 2 (2017), 17042. DOI: 10.1038/natrevmats.2017.42.
  2. L. N. Quan, B. P. Rand, R. H. Friend, S. G. Mhaisalkar, T. W. Lee , and E. H. Sargent. Perovskites for Next-Generation Optical Sources. Chem. Rev. 119, (2019) 7444-7477. DOI: 10.1021/acs.chemrev.9b00107.
  3. J. Y. Kim, J. W. Lee, H. S. Jung, H. Shin, and N. G. Park. High-Efficiency Perovskite Solar Cells. Chem. Rev. 120, (2020) 7867-7918. DOI: 10.1021/acs.chemrev.0c00107.
  4. C. Li, X. Wang, E. Bi, F. Jiang, S. M. Park, Y. Li, L. Chen, Z. Wang, L. Zeng, H. Chen. Rational design of Lewis base molecules for stable and efficient inverted perovskite solar cells. Science 379, (2023) 690-694. DOI: 10.1126/science.ade3970.
  5. S. Zhang, F. Ye, X. Wang, R. Chen, H. Zhang, L. Zhan, X. Jiang, Y. Li, X. Ji, S. Liu. Minimizing buried interfacial defects for efficient inverted perovskite solar cells. Science 380, (2023) 404-409. DOI: 10.1126/science.adg3755.