Abstract
Despite advanced research on device structures and processing conditions of perovskite-based solar cell, many performance aspects are still less understood. The situation becomes more complex in the case of hole transport free (HTM), open-air synthesized solar cell which has an immense potential for low cost and easy fabrication processes. In this work, a correlation between performance deciding parameters with transport and recombination mechanism for the HTM free open-air synthesized perovskite solar cells are studied. The current-voltage response of the fabricated solar cells is not only limited by the phenomenon of transport and recombination but also the injection efficiency of charge carriers. In comparison with the efficient HTM perovskite solar cells, the domination of space charge limited current inside the perovskite layer in HTM free solar cell limits the performance of the device. The interfacial energetic of the active junction i.e. TiO2/perovskite was studied using capacitive analysis that depicts the charge distribution and kinetics in a solar cell. Indeed, the present work illustrates the way to identify the performance limiting parameters in HTM free perovskite solar cell to improve the performance of future devices.