To　allow　for　simultaneous　textural　engineering　and　doping　of　carbon　nitride　materials　with　heteroatoms,　urea　has　been　polymerized　with　an　ionic　liquid.　The　role　of　urea　is　to　create　a　delamination　effect　during　carbon　nitride　synthesis,　whereas　ionic　liquid　functions　as　texture　modifier　as　well　as　B/F　dopant　source.　This　will　result　in　the　rational　fabrication　of　boron-　and　fluorine-containing　2D　carbon　nitride　nanosheets　with　enhanced　optical　harvesting　and　charge　separation　capabilities　for　hydrogen　evolution　catalysis　using　visible　light.　We　believe　that　the　innovative　modification　strategy　developed　herein　can　be　coupled　with　the　already　known　modification　tools　of　2D　carbon　nitride,　thus　further　developing　a　new　family　of　light-harvesting　2D　platforms　for　the　efficient　and　sustained　utilization　of　solar　radiation　for　a　variety　of　advanced　applications,　including　CO2　photofixation,　organic　photosynthesis,　and　pollutant　controls.　BuILd　your　own　semi:　Simultaneous　nanoarchitectual　engineering　and　doping　of　a　robust　carbon　nitride　semiconductor　has　been　demonstrated　by　a　direct　co-condensation　of　urea　and　an　ionic　liquid　(e.g.,　[Bmim][BF4]),　yielding　boron-　and　fluorine-containing　two-dimensional　carbon　nitride　nanosheets　with　enhanced　optical　harvesting　and　charge　separation　capabilities　for　hydrogen　evolution　catalysis　with　visible　light.　©　2014　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim.