Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis

Abstract Ion migration has been proposed as a possible cause of photovoltaic current–voltage hysteresis in hybrid perovskite solar cells. A major objection to this hypothesis is that hysteresis can be reduced by changing the interfacial contact materials; however, this is unlikely to significantly influence the behaviour of mobile ionic charge within the perovskite phase. Here, we show that the primary effects of ion migration can be observed regardless of whether the contacts were changed to give devices with or without significant hysteresis. Transient optoelectronic measurements combined with device simulations indicate that electric-field screening, consistent with ion migration, is similar in both high…

• IC
  Imperial College London
• EA
  Engineering and Physical Sciences Research Council

  Awards: EP/G037515/1, EP/M014797/1, EP/I019278/1, G037515/1, EP/M025020, EP/J002305/1, EP/I019278, EP/M023532/1, EP/M025020/1, EP/M025020/1, EP/G037515, EP/J021199/1, EP/J002305/1, EP/I019278/1, EP/M014797/1