In situ cross linking strategy for efficient and operationally stable methylammoniun lead iodide solar cells
Long term operational stability is the foremost issue delaying the commercialization of perovskite solar cells (PSCs) Here we demonstrate an in situ cross linking strategy for operationally stable inverted MAPbI3 PSCs through the incorporation of a cross linkable organic small molecule additive trimethylolpropane triacrylate (TMTA) into perovskite films. TMTA can chemically anchor to grain boundaries and then in situ cross link to a robust continuous network polymer after thermal treatment, thus enhancing the thermal, water resisting and light resisting properties of organic/perovskite films. As a result, the cross linked PSCs exhibit 590 fold improvement in operational stability, retaining nearly 80% of their initial efficiency after continuous power output for 400 h at maximum power point under full sun AM 1.5 G illumination of Xenon lamp without any UV filter. In addition, under moisture or thermal (85 degC) conditions, cross linked TMTA based PSCs also show excellent stability with over 90% of their initial or post burn in efficiency after aging for over 1000 h.The stability of perovskite solar cell remains the biggest challenge that hinders its commercialization. Here Li et al. incorporate crosslinkable molecules to form a crosslinked perovskite film and increase the device operational stability by 590 times to 400 h under standard Xenon lamp without filters.
Nature Communications