Research ArticlePHYSICAL SCIENCE

Anomalous photovoltaic effect in organic-inorganic hybrid perovskite solar cells

+ See all authors and affiliations

Science Advances  17 Mar 2017:
Vol. 3, no. 3, e1602164
DOI: 10.1126/sciadv.1602164

You are currently viewing the abstract.

View Full Text

Abstract

Organic-inorganic hybrid perovskites (OIHPs) have been demonstrated to be highly successful photovoltaic materials yielding very-high-efficiency solar cells. We report the room temperature observation of an anomalous photovoltaic (APV) effect in lateral structure OIHP devices manifested by the device’s open-circuit voltage (VOC) that is much larger than the bandgap of OIHPs. The persistent VOC is proportional to the electrode spacing, resembling that of ferroelectric photovoltaic devices. However, the APV effect in OIHP devices is not caused by ferroelectricity. The APV effect can be explained by the formation of tunneling junctions randomly dispersed in the polycrystalline films, which allows the accumulation of photovoltage at a macroscopic level. The formation of internal tunneling junctions as a result of ion migration is visualized with Kelvin probe force microscopy scanning. This observation points out a new avenue for the formation of large and continuously tunable VOC without being limited by the materials’ bandgap.

Keywords
  • perovskite
  • solar cells
  • Anomalous Photovoltaic Effect
  • Organic-Inorganic Hybrid Perovskite

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

View Full Text

Related Content