Back-contact　silicon　solar　cells,　valued　for　their　aesthetic　appeal　because　they　have　no　grid　lines　on　the　sunny　side,　find　applications　in　buildings,　vehicles　and　aircraft　and　enable　self-power　generation　without　compromising　appearance1-3.　Patterning　techniques　arrange　contacts　on　the　shaded　side　of　the　silicon　wafer,　which　offers　benefits　for　light　incidence　as　well.　However,　the　patterning　process　complicates　production　and　results　in　power　loss.　We　employed　lasers　to　streamline　the　fabrication　of　back-contact　solar　cells　and　enhance　the　power-conversion　efficiency.　Using　this　approach,　we　produced　a　silicon　solar　cell　that　exceeded　27%　efficiency.　Hydrogenated　amorphous　silicon　layers　were　deposited　onto　the　wafer　for　surface　passivation　and　to　collect　light-generated　carriers.　A　dense　passivating　contact,　which　differs　from　conventional　technology　practice,　was　developed.　Pulsed　picosecond　lasers　operating　at　different　wavelengths　were　used　to　create　the　back-contact　patterns.　The　approach　developed　is　a　streamlined　process　for　producing　high-performance　back-contact　silicon　solar　cells,　with　a　total　effective　processing　time　of　about　one-third　that　of　the　emerging　mainstream　technology.　To　meet　the　terawatt　demand,　we　developed　indium-less　cells　at　26.5%　efficiency　and　precious　silver-free　cells　at　26.2%　efficiency.　Thus,　the　integration　of　solar　solutions　into　buildings　and　transportation　is　poised　to　expand　with　these　technological　advances.　We　fabricated　silicon　heterojunction　back-contact　solar　cells　using　laser　patterning,　producing　cells　that　exceeded　27%　power-conversion　efficiency.