Table 2

PV parameters of devices with KCN and NH4OH surface treatment, see Figure 2b. Percentages correspond to the Mg content of the buffer layer.

V OC (mV) J SC (mA/cm2) FF (%) η (%)
14% 545 35.6 57 11.0
16% 624 35.5 67 14.7
18% 623 34.8 55 12.0
20% 547 30.2 17 3.0

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