Solvent Engineering Technique to Enhance the Efficiency and Stability of Silver-Bismuth Halide Materials for Lead- Free Perovskite Solar Cells
Ashish Kulkarni a, Ajay Jena a, Masashi Ikegami a, Tsutomu Miyasaka a
a Graduate School of Engineering, Toin University of Yokohama, 1614, Kuroganecho, Aoba, Yokohama 225-8503, Japan.
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Ashish Kulkarni, 291
Publication date: 21st February 2018

Organic-inorganic lead halide perovskite undergoes degradation when exposed to moisture, oxygen, heat and continuous light illumination, further exposing the toxic lead iodide (degraded product) to the environment.1,2 Although low dimensional bismuth perovskites have demonstrated exceptional long-term stability against moisture and heat, their poor efficiency due to large bandgap, high exciton binding energy leaves less scope for further enhancement in efficiency.3,4 For better optical properties three-dimensional materials are superior to lower dimensional one, due to lower exciton binding energy and suitable band gap. Three-dimensional silver-bismuth halide (SBH) based light absorbing materials have attracted recent attention due to their bandgap suitability for photovoltaic applications.5 However, their efficiency (0.4%) is far behind that of lead-halide perovskites (20%). Herein we present solvent engineering technique to obtain a uniform morphology of SBH. Additionally, the solvent engineering technique promotes preferred crystallographic SBH grain growth along (400) direction evidencing its cubic structure. Devices incorporating SBH as an active layer in TiO2 mesostructured architecture with polymer hole transporting material (HTM) demonstrated improved efficiency in contrast to the devices fabricated without solvent engineering technique. Moreover, devices showed improved long-term stability against moisture, light-soaking and heat stress. Additionally, further direction for efficiency enhancement of non-toxic silver-bismuth halide materials based photovoltaic devices will be presented.

References:

1. Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T., J. Am. Chem. Soc. 2009, 131, 6050-6051.

2. Legitens, T.; Bush, K.; Cheacharoen, R.; Beal, R.; Bowring, A.; McGehee, M. D., J. Mater. Chem. A, 2017, 5, 11483-11500.

3. Kulkarni, A.; Singh, T.; Ikegami, M.; Miyasaka, T., RSC Adv., 2017, 7, 9456-9460.

4. Kulkarni, A.; Singh, T.; Jena, A.; Pinpithak, P.; Ikegami, M.; Miyasaka, T., ACS Appl. Mater. Interfaces, 2018, 10 (11), pp 9547–9554

5. Baranwal, A. K.; Masutani, H.; Sugita, H.; Kanda, H.; Kanaya, S.; Shibiyama, N.; Sanehira, Y.; Ikegami, M.; Numata, Y.; Yamada, K.; Miyasaka, T.; Umeyama, T.; Imahori, H.; Ito, S., Nano Convergence, 2017, doi.org/10.1186/s40580-017-0120-3

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