Indexed on: 08 Sep '20Published on: 08 Sep '20Published in: Journal of Physical Chemistry Letters
A hybrid organic-inorganic perovskite in a diode structure can lead to multifunctional device phenomena exhibiting both a high-power conversion efficiency (PCE) of a solar cell and strong electroluminescence (EL) efficiency. Non radiative losses in such multifunctional devices lead to open circuit voltage (Voc) deficit which is a limiting factor to push the efficiency towards Shockley-Queisser (SQ) limit. In this work we analyse and quantify the radiative limit of Voc in perovskite solar cell as a function of its absorber thickness. We correlate PCE and EL efficiency at varying thicknesses to understand the limiting factors for high Voc. With certain increase in perovskite thickness, PCE improves but EL efficiency is compromised and, vice versa. Thus, correlating these two figures of merits of a solar cell guides towards light management strategy together with minimizing non-radiative losses. The results demonstrate that maximizing absorption and emission processes remains paramount for optimizing devices.