This PDF file includes:

• section S1. Supplementary data on laser irradiation
  
• section S2. Supplementary photocurrent measurements
  
• section S3. Power dependence of the photothermoelectric and photovoltaic effects
  
• section S4. Estimation of chemical potential and conductivity for decoupled graphene layers
  
• section S5. Physical explanation for a purely photovoltaic response
  
• section S6. Correction of responsivity spectra for substrate reflections
  
• fig. S1. Inferred stacking order of four-layer FeCl₃-FLG.
  
• fig. S2. Calibration of laser-induced displacement of FeCl₃.
  
• fig. S3. Bandwidth of a laser-written FeCl₃-FLG junction device.
  
• fig. S4. NEP of laser-written FeCl₃-FLG junction device.
  
• fig. S5. Characterization of supported pristine graphene devices.
  
• fig. S6. Additional measurements of photocurrent in supported pristine graphene devices.
  
• fig. S7. Photoresponse at p-p′ junction in FLG.
  
• fig. S8. Calculation of the carrier concentration and chemical potential at p-p′ interfaces of FeCl₃-FLG.
  
• fig. S9. Direction of photocurrent at p-p′ junctions of FeCl₃-FLG.
  
• fig. S10. Correction of spectral responsivity for substrate reflections.
  
• table S1. LDR of graphene and functionalized graphene devices.
  
• table S2. Summary of power-law exponents possible for photocurrent originating from the photothermoelectric effect.
  
• table S3. Corrections to responsivity for the laser wavelengths used in this work.
  
• References (38–47)

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