SnO2 Passivation and Enhanced Perovskite Charge Extraction with a Benzylamine Hydrochloric Interlayer,ACS Applied Materials & Interfaces

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SnO2 Passivation and Enhanced Perovskite Charge Extraction with a Benzylamine Hydrochloric Interlayer
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-12-06 , DOI: 10.1021/acsami.1c17788
Nianci Guan ₁ , Chenxin Ran ₁ , Yue Wang ₁ , Lingfeng Chao ₁ , Zhaoqi Deng ₁ , Guo Wu ₁ , He Dong ₁ , Yaqi Bao ₁ , Zongqiong Lin ₁ , Lin Song ₁

Affiliation

Perovskite solar cells (PSCs) have gained much attention because of their expressive power conversion efficiency (PCE) of up to 25.5%. A good contact and a well-aligned energy level at the buried interfaces between electron transport layers (ETLs) and perovskite films play an essential role in promoting charge-carrier collection and suppressing nonradiative recombination. Currently, low-temperature-processed SnO₂ thin films are widely used as the ETLs to achieve efficient and stable planar PSCs. However, fabricating proper SnO₂/perovskite interfaces with a good contact and a well-aligned energy level is necessary but implies a great challenge. Herein, we modify the SnO₂ ETL using benzylamine hydrochloride (BH), which is expected to facilitate the energy level alignment and to enhance perovskite crystallization. Moreover, the BH interlayer is found to effectively reduce the trap-state density and thereby improve the charge-carrier extraction between the ETL and the perovskite layer. Consequently, the PSC with BH modification yields a higher PCE, a lower hysteresis, and better stability than the device without a BH interlayer. This study highlights the key role of molecule modification of ETLs in designing efficient and stable PSCs.

中文翻译：

使用盐酸苄胺中间层的 SnO2 钝化和增强的钙钛矿电荷提取

钙钛矿太阳能电池 (PSC) 因其高达 25.5% 的表达功率转换效率 (PCE) 而备受关注。在电子传输层 (ETL) 和钙钛矿薄膜之间的掩埋界面处的良好接触和良好排列的能级在促进电荷载流子收集和抑制非辐射复合方面发挥着重要作用。目前，低温处理的SnO ₂薄膜被广泛用作ETL，以实现高效稳定的平面PSC。然而，制造具有良好接触和良好对齐能级的合适的SnO _{2 /钙钛矿界面是必要的，但这意味着一个巨大的挑战。}在此，我们修改了 SnO ₂使用苄胺盐酸盐 (BH) 的 ETL，有望促进能级对齐并增强钙钛矿结晶。此外，发现 BH 中间层有效地降低了陷阱态密度，从而改善了 ETL 和钙钛矿层之间的电荷载流子提取。因此，与没有 BH 中间层的器件相比，具有 BH 改性的 PSC 产生更高的 PCE、更低的滞后和更好的稳定性。本研究强调了 ETL 分子修饰在设计高效稳定 PSC 中的关键作用。

更新日期：2021-12-06

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