Stability　problem　of　organic　semiconductors　(OSCs)　because　of　photoabsorption　has　become　a　major　barrier　to　large　scale　applications　in　organic　field-effect　transistors　(OFETs).　It　is　imperative　to　design　OSCs　which　are　insensitive　to　visible　and　near-infrared　(VNIR)　light　to　obtain　both　environmental　and　operational　stability.　Herein,　taking　a　2,3,8,9-tetramethoxy　[1,4]benzodithiino[2,3-b][1,4]benzodithiine　(TTN2)　as　an　example,　we　show　that　controlling　molecular　configuration　is　an　effective　strategy　to　tune　the　bandgaps　of　OSCs　for　visible-blind　OFETs.　TTN2　adopts　an　armchair-like　configuration,　which　is　different　from　the　prevailing　planar　structure　of　common　OSCs.　Because　of　the　large　bandgap,　TTN2　exhibits　no　photoabsorption　in　the　VNIR　region　and　OFETs　based　on　TTN2　show　high　environmental　stability.　The　devices　worked　well　after　being　stored　in　ambient　air,　(i.e.　in　the　presence　of　oxygen　and　water)　and　light　for　over　two　years.　Moreover,　the　OFETs　show　no　observable　response　to　light　irradiation　from　405-1,020　nm,　which　is　also　favorable　for　high　operational　stability.