Effect of Additive Engineering on the Performance of Wide-Bandgap Perovskite Solar Cells

Saurabh Srivastava^a, Sudhir Ranjan^b, Kanwar Singh Nalwa^c, Sarang Ingole^a, Raju Kumar Gupta^b^,^c, Ashish Garg^c

^aDepartment of Materials Science and Engineering, Indian Institute of Technology Kanpur, India 208016

^bDepartment of Chemical Engineering, Indian Institute of Technology Kanpur, India 208016

^cDepartment of Sustainable Energy Engineering, Indian Institute of Technology Kanpur, India 208016

Proceedings of SUNRISE IV - Transition to Net Zero (SUNRISEIV)

Online, Spain, 2022 February 10th - 11th

Organizers: Georgia Bevan, Ashish Garg, Raju Gupta, Ian Mabbett, Hari Upadhyaya, Adrian Walters and Sara Walters

Poster, Saurabh Srivastava, 009
Publication date: 7th February 2022

ePoster:

Wide-bandgap (WBG) perovskite solar cells suffer from large Voc deficit due to photo-induced trap formation by halide segregation. The mixed I/Br phase segregate under illumination and photo-carriers are funneled into the low-E_g I-rich domains which in turn reduce the Voc of the device. In this work, we study the impact of additive engineering on reducing the defect density and improving the device performance of FACs-based WBG perovskite solar cells. We used NH₄Cl as an additive into the perovskite precursor solution to control the film crystallization giving rise to large grains in the perovskite films and effectively passivate the internal defects in the WBG perovskite films. An optimized addition of 0.3 mol% NH₄Cl in the precursor solution improved the optical properties and morphology of the perovskite films with grain size reaching ~ 900 nm. An enhancement in the device performance was observed due to Cl incorporation and a V_oc deficit of ~ 0.59 eV was obtained for the best performing devices.

References:

[1] G. Kim, C. S. Moon, T.-Y. Yang, Y. Y. Kim, J. Chung, E. H. Jung, et al., A Thermally Induced Perovskite Crystal Control Strategy for Efficient and Photostable Wide‐Bandgap Perovskite Solar Cells, Solar RRL 4, 2020

[2] T. Bu, J. Li, Q. Lin, D. P. McMeekin, J. Sun, M. Wang, et al., Structure engineering of hierarchical layered perovskite interface for efficient and stable wide bandgap photovoltaics, Nanoenergy 75, 104917, 2020

[3] X. Liu, Z. Wu, X. Fu, L. Tang, J. Li, J. Gong, et al., Highly efficient wide-band-gap perovskite solar cells fabricated by sequential deposition method, Nanoenergy 86, 106114, 2021

[4] R. He, T. Chen, Z. Xuan, T. Guo, J. Luo, Y. Jiang, et al., Efficient wide-bandgap perovskite solar cells enabled by doping a bromine-rich molecule, Nanophotonics 10, 2059, 2020

Acknowledgements:

We acknowledge Indo-UK SUNRISE program for the financial support and IIT Kanpur for the fabrication and characterization facilities.

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