NOVELTY - A nanoink composition for forming an absorber layer of a thin film solar cell comprises: particles containing at least one element selected from group IB and/or IIIA and/or VIA; and a volatile chelating agent mixing with the particles, where the volatile chelating agent is a polyetheramine which is selected from monoamine compounds, diamine compounds and triamine compounds and has a molecular weight of 100-4000.    USE - As nanoink composition for forming an absorber layer of a thin film solar cell (claimed).    ADVANTAGE - In the method for producing the nanoink composition, copper indium gallium diselenide (CIGS) or CIS thin film can be formed only by a simple coating and printing process without requirement of alternative vacuum processing or complex equipment. Particularly, the method is applied in a single-stage process instead of the conventional multiple-stage process so that reduction of manufacturing costs is capable of accomplishment. In addition, the volatile chelating agent is easily removed without any residues in an absorber layer and provides certain viscosity to act as a binder during coating or printing process, and thus any viscosity increaser would not be added further, even in a coating or printing processes afterward.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for producing a nanoink composition for forming an absorber layer of a thin film solar cell, involving: a) obtaining particles containing at least one element selected from group IB and/or IIIA and/or VIA; b) adding a volatile chelating agent mixing with the particles, where the volatile chelating agent is a polyetheramine which is selected from monoamine compounds, diamine compounds and triamine compounds and has a molecular weight of 100-4000; and c) heating the volatile chelating agent to a reflux temperature at which the volatile chelating agent is boiling, and reacting the boiling volatile chelating agent with the particles in an inert gas environment.