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(a) Effect of wet treatment before buffer deposition on JV curves. Absorber treatments with NH4OH or thiourea-ammonia solution show increased V OC. Additional (b) Influence of a single TMA pulse before and during buffer deposition, with unchanged total ZnMgO thickness. TMA before Zn1−xMgxO increases V OC and reduces ageing. TMA during Zn1−xMgxO reduces V OC.
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