We report a newabsorber material for quantum dot-sensitized solar cells (QDSCs). PbBi4S7 nanocrystals (NCs) have been synthesized using a two-stage successive ionic layer adsorption and reaction technique. The synthesized NCs have an average size of similar to 14 nm and an optical bandgap of similar to 1.3 eV. PbBi4S7 QDSCs were fabricated from the synthesized NCs for the first time. The best cell, fabricated with an Au counter electrode and a polysulfide electrolyte, yielded a short-circuit current density J(sc) of 4.84 mA/cm(2), an open-circuit voltage V-oc of 0.12 V and an efficiency. of 1.26% under the reduced light intensity of 14% sun. When the polysulfide electrolyte was replaced by a cobalt electrolyte with a lower redox level, the V-oc increased to 0.37 V and the eta increased to 1.48%. The EQE spectrum covered the visible and near-infrared ranges of 300-1000 nm with a maximum EQE of 63.4% at lambda = 450 nm. The relatively large photocurrent of J(sc) similar to 16 mA/cm(2), which results from the broad absorption band, is an attractive property for a solar absorber material. This work demonstrates that PbBi4S7 shows potential as a solar material that could generate large photocurrents. (C) 2017 The Electrochemical Society. All rights reserved.