The decrease is quite significant considering that the thermal conductivity of undoped CsSnI 3 is already in the ultralow regime, and the thermal conductivity of undoped CsGeI 3 is expected to be marginally higher (though still low at ∼0.59 W/mK). 44 The origins of this reduced thermal conductivity are explored below.
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Reduced Thermal Conductivity and Improved Stability by B-Site Doping in Tin Halide Perovskites.
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