Thisbookisacompilationofresearcharticlesrelatedtotheapplicationoforganicsemiconductormaterialsinthefieldofelectronicssuchasfieldeffecttransistors,lightemittingdiodesandinharvestingsolarenergyviasolarcells.Chapter1acquaintsthereaderwiththeprogressmadesofarandfuturepotentialinthefieldoforganicsemiconductorshighlightingtheiremploymentasorganiclightemittingdiodes(OLEDs)forflexibleelectronicsandlighting,asorganicfieldeffecttransistors(OFETs)andasorganicphotovoltaics.Inchapter2,anoveltechnologyofutilizingaluminumlaminationsasmoisturebarriersagainstambientaggressorsinordertoenhancedeviceperformance,especiallyinorganicsolarcellsandOLEDshasbeendemonstrated.Chapters3-5focusonthefabricationroutesoforganicelectronicssuchasOFETsandorganicsolarcells.Thefurtherchaptersofthisbookarebroadlyclassifiedintothreecategoriesaddressingthethreekeyapplicationsofthesematerials-OFETs,organicsolarcellsandOLEDs.Inchapters6-13,thevariousmaterials,theirsynthesis,properties,processingparametersandtheirapplicationinOFETshasbeenillustrated.ApplicationofOFETsindetectingbloodgasessuchasammoniahasbeenshowninchapter13.Chapters14-focusesoncriticallightinstabilityinCB/DIOprocessedPBDTTT-EFT:PC71BMorganicphotovoltaicdevices."Istronglybelievethatthisbookwillhelpstudents,engineersandresearchersworkinginthefieldofelectricalengineering,chemistry,physicsandmaterialsciencetobuildupontheirexistingknowledge.Thecollectionofarticlesandreviewarticlesisuptodateandthereadercankeepthemselvesabreastwiththelatestdevelopmentsinthefieldoforganicsemiconductorsthroughthisbook.