Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
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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