Substrate laminate, image sensor, and method for manufacturing substrate laminate

A method for manufacturing a substrate laminate, comprising:

• a step Sa of applying a photosensitive composition to one surface of a first substrate to form a coating film on the surface;
• a step Sb of irradiating the coating film with an active energy ray through a photomask to form an exposed portion formed of a semi-cured photosensitive composition and a non-exposed portion in the coating film;
• a step Sc of removing the non-exposed portion from the first substrate with an alkaline developer to form a patterned coating film on the first substrate;
• a step Sd of heating the patterned coating film to further cure the semi-cured photosensitive composition, thereby obtaining a first layer including a patterned cured product;
• and
• a step Se of bonding the first layer and a second substrate to each other with an adhesive interposed therebetween, and then curing the adhesive to obtain a second layer that bonds the first layer and the second substrate, wherein
• the photosensitive composition contains a curable compound having a cationically polymerizable group and a photocationic polymerization initiator, and has alkali solubility, and
• a reaction ratio of the curable compound in the first layer before the step Se is 90% or more.