Preparation of Perovskite: Fullerene Bulk Heterojunction Using a Surfactant Free Microemulsion Scheme. Modeling, Simulation and Experimental Studies

Authors Devashri P. Upasani , Hemant S. Tarkas , Jaydeep V. Sali

Department of Physics, School of Physical Sciences, K.B.C. North Maharashtra University, 425001 Jalgaon India

Issue Volume 14, Year 2022, Number 4
Dates Received 22 April 2022; revised manuscript received 11 August 2022; published online 25 August 2022
Citation Devashri P. Upasani, Hemant S. Tarkas, Jaydeep V. Sali, J. Nano- Electron. Phys. 14 No 4, 04013 (2022)
PACS Number(s), 85.60. – q
Keywords Perovskite (6) , Perovskite:ICBA bulk heterojunction (BHJ), Surfactant free microemulsion (SFME), Simulation (34) , Morphology control through microemulsion composition.

CH3NH3PbI3 perovskite material has shown excellent optoelectronic properties for its use in solar cells. However, issues like stability and dissimilarity in charge carrier mobility limits its applicability in Bulk Heterojunction (BHJ) solar cells. Efforts have been made by incorporating suitable conjoining material in BHJ to increase stability and performance of solar cells. However, the solubility of BHJ components in one solution may pose problems in the single-step synthesis of BHJ. Here, we report our theoretical and experimental work on preparing perovskite: Indene C60-Bisadduct (ICBA) BHJ using a Cyclohexane:Acetone:DMSO (CAD) Surfactant Free Microemulsion (SFME) scheme, which can solve the problem of the solubility of BHJ components in a single solution. A critical initial acetone volume fraction is essential to maintain the stability of the microemulsion depending on its composition. With the help of theoretical simulation, we studied evaporation dynamics of SFME with a range of initial acetone volume, which can take SFME from an unstable state to a stable one. It was observed that, depending on the initial acetone volume fraction and substrate temperature, the solidifying thin film of SFME on the substrate may transit through different states related to its stability. This can have marked effect on the structural and optoelectronic properties of BHJ. Experimental studies confirmed these predictions. This method can open a novel way of tailoring perovskite:organic BHJ for optimum performance in optoelectronic devices.

List of References