because of its unique properties including high light absorption coefficient, high charge carrier mobility, and large charge carrier diffusion length. [11][12][13] Besides, high-quality perovskite films can be fabricated on a large scale by facile and inexpensive solution methods, which promote mass production of perovskite-based optoelectronics devices. [2,14,15] For example, a slot-die printing technology has been recently developed to continuously fabricate a formamidinium cesium lead triiodide (FACsPbI 3 ) perovskite film as large as 400 cm 2 in one batch. [16] In addition to perovskites for light absorbing and charge carrier generating, electrodes are also indispensable to optoelectronic devices for charge carrier collection. [17,18] Traditionally, noble metals including gold, [19,20] silver, [21,22] and platinum, [23] are used as electrodes for their high conductivity and appropriate work functions. [17] However, these metal electrodes are typically deposited onto the perovskite films by magnetron sputtering or thermal evaporation under extreme conditions (i.e., high temperature and vacuum), [8,18,24] hindering mass production of the perovskite-based optoelectronic devices. Thus, it is crucial to develop new electrodes to realize whole-device mass production.Laser-induced graphene (LIG) is a promising candidate for this purpose. It has been employed as excellent electrodes for various electronic devices, [25][26][27] obtained by direct laser writing (DLW), a mask-free microfabrication technique with low cost and high scalability. [28] The conductivity of LIG electrodes is high [28] while the cost is low because it can be synthesized from multiple carbon sources ranging from commercially available polymer films to agricultural wastes. [29][30][31] Moreover, as a carbon material, LIG would have higher chemical stability than metal materials, which tend to react with lead halide species resulting in device degradation. [17,18,32] So far, LIG electrodes have been demonstrated for large-scale fabrication of microsupercapacitors, [25] wearable humidity sensors, [26] and soil sensors. [27] Therefore, LIG has the potential of serving as electrodes for perovskite-based optoelectronics and realizing whole-device mass production.To conceptually verify this idea, herein, we propose a whole-device mass-producible perovskite photodetector based on LIG electrodes, considering the critical significance of Perovskites have attracted enormous attention in optoelectronics, owing to their excellent optoelectronic properties, low-cost constituents, and simple solution fabrication approaches. Despite significant advances in large-scale production of perovskite films, electrode layers-indispensable components of an optoelectronic device-are typically fabricated by depositing noble metals onto perovskite films using complicated techniques, which hinder the large-scale production of optoelectronic devices. Herein, a whole-device mass-producible perovskite photodetector is developed using low-cost and high-scalability direct laser w...