The most widely studied photovoltaic device in current literature are flexible thin film planar Perovskite Solar Cells (PSCs). Perovskite solar technology has been evolving for over a decade reaching impressive power conversion efficiencies (PCEs) of over 25%. Thin film PSCs are flexible and lightweight, enabling installation upon any type of surface. They are also scalable, being roll-to-roll compatible _[1], enabling the manufacture of such technologies to be rapid and low cost. We introduce a novel thin Back-Contact (BC) Perovskite Solar Micro Module architecture consisting of a series of electrically connected V-shaped microgrooves containing selectively evaporated n- and p-type contacts on each groove wall _[2]. This is followed by scalable deposition of the Perovskite absorbing layer, being in direct contact with the illuminating source allowing for highly conductive n and p type materials to be employed as the requirement for transparent materials is diminished. Some enhancements in planar PSCs performance can be attributed to surface treatments such as UV-Ozone and Oxygen plasma treatments and are commonly employed to improve the bulk and interfacial properties of the as deposited n and p-type materials in isolation. However, with the BC device architecture both n and p-type semiconductors are exposed to surface treatment. A surface treatment enhancing both n and p-type interfacial and semi-conducting properties simultaneously is required to enhance electrical performance. During this work a new treatment method was developed that allows for simultaneous enhancements of both n and p-type materials. It was found that PCEs, open circuit voltage (Voc), short circuit current (Jsc) and fill factor (FF) increases by up to 201%, 26.7%, 94.1% and 22.6% respectively. Analysis has been conducted to explain the mechanisms responsible for electrical performance enhancement. Multiple factors are combined to improve the performance of micro-modules these include surface energy, surface stoichiometry and charge transport capabilities. Contact angle analysis reveals that the wettability of both n and p type surfaces are improved whilst reducing void formation. X-Ray Photoemission Spectroscopy (XPS) analysis indicates improvements in p-type surface chemistry whilst having potential to be detrimental to the n type material. However, through careful control of processing parameters benefits of p type stoichiometry can be maintained whilst having minimal detriment to the n type material. Time resolved Photoluminescence (TRPL) demonstrates that surface enhancements improve charge transport capabilities resulting in the observed photovoltaic performance.