Hybrid Perovskite/Perovskite Heterojunction Solar Cells

Authors:
Open Access
Publisher website
Google Scholar
Abstract
Recently developed organic-inorganic hybrid perovskite solar cells combine low-cost fabrication and high power conversion efficiency. Advances in perovskite film optimization have led to an outstanding power conversion efficiency of more than 20%. Looking forward, shifting the focus towards new device architectures holds the great potential to induce the next leap in device performance. Here, we report the demonstration of a perovskite/perovskite heterojunction solar cell. We developed a facile solution-based cation infiltration process to deposit layered perovskite (LPK) structures onto methylammonium lead iodide (MAPI) films. Grazing-incidence wide angle X-ray scattering experiments were performed to gain insights into the crystallite orientation and the formation process of the perovskite bilayer. Our results show that the selfassembly of the LPK layer on top of an intact MAPI layer is accompanied by a reorganization of the perovskite interface. This leads to an enhancement of the open-circuit voltage and power conversion efficiency due to reduced recombination losses, as well as improved moisture stability in the resulting photovoltaic devices.
Funding Information
  • Bundesministerium f?r Bildung und Forschung (01162525/1)
  • Deutsche Forschungsgemeinschaft
  • Directorate-General for Research and Innovation
  • Government of Bavaria
  • Center for NanoScience, Ludwig-Maximilians-Universit?t M?nchen

This publication has 50 references indexed in Scilit: